64238931 has 12 divisors (see below), whose sum is σ = 96824208. Its totient is φ = 40963824.

The previous prime is 64238927. The next prime is 64238953. The reversal of 64238931 is 13983246.

64238931 is a `hidden beast` number, since 642 + 3 + 8 + 9 + 3 + 1 = 666.

It is not a de Polignac number, because 64238931 - 2² = 64238927 is a prime.

It is a super-2 number, since 2×64238931² = 8253280512045522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64238921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154960 + ... + 155373.

It is an arithmetic number, because the mean of its divisors is an integer number (8068684).

Almost surely, 2^64238931 is an apocalyptic number.

64238931 is a deficient number, since it is larger than the sum of its proper divisors (32585277).

64238931 is a wasteful number, since it uses less digits than its factorization.

64238931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310362 (or 310359 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 64238931 is about 8014.9192759503. The cubic root of 64238931 is about 400.4971547535.

The spelling of 64238931 in words is "sixty-four million, two hundred thirty-eight thousand, nine hundred thirty-one".