64684656 has 120 divisors (see below), whose sum is σ = 190654464. Its totient is φ = 21228480.

The previous prime is 64684651. The next prime is 64684657. The reversal of 64684656 is 65648646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64684651) 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, 493711 + ... + 493841.

Almost surely, 2^64684656 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 64684656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95327232).

64684656 is an abundant number, since it is smaller than the sum of its proper divisors (125969808).

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

64684656 is a wasteful number, since it uses less digits than its factorization.

64684656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 263 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 64684656 is about 8042.6771662177. The cubic root of 64684656 is about 401.4213103770.

The spelling of 64684656 in words is "sixty-four million, six hundred eighty-four thousand, six hundred fifty-six".