64972923 has 4 divisors (see below), whose sum is σ = 86630568. Its totient is φ = 43315280.

The previous prime is 64972889. The next prime is 64972939. The reversal of 64972923 is 32927946.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64972923 - 2⁸ = 64972667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64972423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10828818 + ... + 10828823.

It is an arithmetic number, because the mean of its divisors is an integer number (21657642).

Almost surely, 2^64972923 is an apocalyptic number.

64972923 is a deficient number, since it is larger than the sum of its proper divisors (21657645).

64972923 is a wasteful number, since it uses less digits than its factorization.

64972923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21657644.

The product of its digits is 163296, while the sum is 42.

The square root of 64972923 is about 8060.5783291275. The cubic root of 64972923 is about 402.0167377502.

The spelling of 64972923 in words is "sixty-four million, nine hundred seventy-two thousand, nine hundred twenty-three".