64938728 has 24 divisors (see below), whose sum is σ = 123082050. Its totient is φ = 32120544.

The previous prime is 64938721. The next prime is 64938749. The reversal of 64938728 is 82783946.

It can be written as a sum of positive squares in only one way, i.e., 62694724 + 2244004 = 7918^2 + 1498^2 .

It is not an unprimeable number, because it can be changed into a prime (64938721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91238 + ... + 91946.

Almost surely, 2^64938728 is an apocalyptic number.

It is an amenable number.

64938728 is a deficient number, since it is larger than the sum of its proper divisors (58143322).

64938728 is a wasteful number, since it uses less digits than its factorization.

64938728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929 (or 818 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The square root of 64938728 is about 8058.4569242504. The cubic root of 64938728 is about 401.9461987519.

The spelling of 64938728 in words is "sixty-four million, nine hundred thirty-eight thousand, seven hundred twenty-eight".