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65880 = 2333561
BaseRepresentation
bin10000000101011000
310100101000
4100011120
54102010
61225000
7363033
oct200530
9110330
1065880
1145551
1232160
1323ca9
141a01a
15147c0
hex10158

65880 has 64 divisors (see below), whose sum is σ = 223200. Its totient is φ = 17280.

The previous prime is 65867. The next prime is 65881. The reversal of 65880 is 8856.

65880 is a `hidden beast` number, since 658 + 8 + 0 = 666.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 65880.

It is not an unprimeable number, because it can be changed into a prime (65881) by changing a digit.

65880 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1050 + ... + 1110.

265880 is an apocalyptic number.

65880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111600).

65880 is an abundant number, since it is smaller than the sum of its proper divisors (157320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65880 is a wasteful number, since it uses less digits than its factorization.

65880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 65880 is about 256.6709956345. The cubic root of 65880 is about 40.3878929836.

It can be divided in two parts, 6 and 5880, that added together give a triangular number (5886 = T108).

The spelling of 65880 in words is "sixty-five thousand, eight hundred eighty".