64638016 has 28 divisors (see below), whose sum is σ = 128955292. Its totient is φ = 32145408.

The previous prime is 64637977. The next prime is 64638031. The reversal of 64638016 is 61083646.

It can be written as a sum of positive squares in 2 ways, for example, as 42510400 + 22127616 = 6520^2 + 4704^2 .

It is a super-2 number, since 2×64638016² = 8356146224832512, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9736 + ... + 14968.

Almost surely, 2^64638016 is an apocalyptic number.

It is an amenable number.

64638016 is a deficient number, since it is larger than the sum of its proper divisors (64317276).

64638016 is a wasteful number, since it uses less digits than its factorization.

64638016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438 (or 5428 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 64638016 is about 8039.7771113383. Note that the first 3 decimals coincide. The cubic root of 64638016 is about 401.3248073694.

The spelling of 64638016 in words is "sixty-four million, six hundred thirty-eight thousand, sixteen".