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65489 = 431523
BaseRepresentation
bin1111111111010001
310022211112
433333101
54043424
61223105
7361634
oct177721
9108745
1065489
1145226
1231a95
1323a68
1419c1b
151460e
hexffd1

65489 has 4 divisors (see below), whose sum is σ = 67056. Its totient is φ = 63924.

The previous prime is 65479. The next prime is 65497. The reversal of 65489 is 98456.

65489 = 162 + 172 + ... + 582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-65489 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (65419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719 + ... + 804.

It is an arithmetic number, because the mean of its divisors is an integer number (16764).

65489 is a Friedman number, since it can be written as 9-56+4^8, using all its digits and the basic arithmetic operations.

265489 is an apocalyptic number.

It is an amenable number.

65489 is a deficient number, since it is larger than the sum of its proper divisors (1567).

65489 is a wasteful number, since it uses less digits than its factorization.

65489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566.

The product of its digits is 8640, while the sum is 32.

The square root of 65489 is about 255.9081866608. The cubic root of 65489 is about 40.3078332238.

The spelling of 65489 in words is "sixty-five thousand, four hundred eighty-nine".

Divisors: 1 43 1523 65489