64868931 has 20 divisors (see below), whose sum is σ = 98357512. Its totient is φ = 42596928.

The previous prime is 64868927. The next prime is 64868981. The reversal of 64868931 is 13986846.

It is not a de Polignac number, because 64868931 - 2² = 64868927 is a prime.

It is a super-2 number, since 2×64868931² = 8415956418165522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64868981) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 550 + ... + 11403.

Almost surely, 2^64868931 is an apocalyptic number.

64868931 is a deficient number, since it is larger than the sum of its proper divisors (33488581).

64868931 is a wasteful number, since it uses less digits than its factorization.

64868931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12032 (or 12023 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 64868931 is about 8054.1250921500. The cubic root of 64868931 is about 401.8021414388.

It can be divided in two parts, 6486 and 8931, that multiplied together give a triangular number (57926466 = T₁₀₇₆₃).

The spelling of 64868931 in words is "sixty-four million, eight hundred sixty-eight thousand, nine hundred thirty-one".