65440256 has 120 divisors (see below), whose sum is σ = 162534240. Its totient is φ = 25712640.

The previous prime is 65440253. The next prime is 65440283. The reversal of 65440256 is 65204456.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (65440253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2110961 + ... + 2110991.

It is an arithmetic number, because the mean of its divisors is an integer number (1354452).

Almost surely, 2^65440256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65440256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81267120).

65440256 is an abundant number, since it is smaller than the sum of its proper divisors (97093984).

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

65440256 is an equidigital number, since it uses as much as digits as its factorization.

65440256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 65440256 is about 8089.5151894288. The cubic root of 65440256 is about 402.9783025794.

Subtracting from 65440256 its product of nonzero digits (28800), we obtain a palindrome (65411456).

The spelling of 65440256 in words is "sixty-five million, four hundred forty thousand, two hundred fifty-six".