64617256 has 32 divisors (see below), whose sum is σ = 133473600. Its totient is φ = 29082240.

The previous prime is 64617251. The next prime is 64617349. The reversal of 64617256 is 65271646.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (64617251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5500 + ... + 12628.

It is an arithmetic number, because the mean of its divisors is an integer number (4171050).

Almost surely, 2^64617256 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 64617256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66736800).

64617256 is an abundant number, since it is smaller than the sum of its proper divisors (68856344).

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

64617256 is a wasteful number, since it uses less digits than its factorization.

64617256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7249 (or 7245 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 64617256 is about 8038.4859270885. The cubic root of 64617256 is about 401.2818378415.

The spelling of 64617256 in words is "sixty-four million, six hundred seventeen thousand, two hundred fifty-six".