65655720 has 96 divisors (see below), whose sum is σ = 229811400. Its totient is φ = 16160256.

The previous prime is 65655713. The next prime is 65655721. The reversal of 65655720 is 2755656.

It can be written as a sum of positive squares in 4 ways, for example, as 20738916 + 44916804 = 4554^2 + 6702^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (65655721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2335 + ... + 11694.

Almost surely, 2^65655720 is an apocalyptic number.

65655720 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 65655720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114905700).

65655720 is an abundant number, since it is smaller than the sum of its proper divisors (164155680).

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

65655720 is a wasteful number, since it uses less digits than its factorization.

65655720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14059 (or 14052 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 65655720 is about 8102.8217307306. The cubic root of 65655720 is about 403.4200907710.

The spelling of 65655720 in words is "sixty-five million, six hundred fifty-five thousand, seven hundred twenty".