64728938 has 16 divisors (see below), whose sum is σ = 98232264. Its totient is φ = 31987200.

The previous prime is 64728931. The next prime is 64728941. The reversal of 64728938 is 83982746.

It can be written as a sum of positive squares in 4 ways, for example, as 60264169 + 4464769 = 7763^2 + 2113^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64728892 and 64728901.

It is not an unprimeable number, because it can be changed into a prime (64728931) 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, 91988 + ... + 92688.

Almost surely, 2^64728938 is an apocalyptic number.

64728938 is a deficient number, since it is larger than the sum of its proper divisors (33503326).

64728938 is a wasteful number, since it uses less digits than its factorization.

64728938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177.

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

The square root of 64728938 is about 8045.4296342706. The cubic root of 64728938 is about 401.5128915174.

The spelling of 64728938 in words is "sixty-four million, seven hundred twenty-eight thousand, nine hundred thirty-eight".