64592978 has 6 divisors (see below), whose sum is σ = 96906519. Its totient is φ = 32290806.

The previous prime is 64592971. The next prime is 64592981. The reversal of 64592978 is 87929546.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 32296489 + 32296489 = 5683^2 + 5683^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5683.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64592971) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8525 + ... + 14207.

Almost surely, 2^64592978 is an apocalyptic number.

64592978 is a deficient number, since it is larger than the sum of its proper divisors (32313541).

64592978 is an frugal number, since it uses more digits than its factorization.

64592978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11368 (or 5685 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 50.

The square root of 64592978 is about 8036.9756749663. The cubic root of 64592978 is about 401.2315749992.

Multiplying 64592978 by its sum of digits (50), we get a square (3229648900 = 56830²).

The spelling of 64592978 in words is "sixty-four million, five hundred ninety-two thousand, nine hundred seventy-eight".