64616656 has 40 divisors (see below), whose sum is σ = 138131784. Its totient is φ = 29091840.

The previous prime is 64616653. The next prime is 64616737. The reversal of 64616656 is 65661646.

It can be written as a sum of positive squares in 4 ways, for example, as 11560000 + 53056656 = 3400^2 + 7284^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64616653) 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, 4740 + ... + 12316.

Almost surely, 2^64616656 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 64616656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69065892).

64616656 is an abundant number, since it is smaller than the sum of its proper divisors (73515128).

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

64616656 is a wasteful number, since it uses less digits than its factorization.

64616656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7639 (or 7633 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 64616656 is about 8038.4486065409. The cubic root of 64616656 is about 401.2805958108.

The spelling of 64616656 in words is "sixty-four million, six hundred sixteen thousand, six hundred fifty-six".