28364931 has 32 divisors (see below), whose sum is σ = 48312320. Its totient is φ = 16111872.

The previous prime is 28364927. The next prime is 28364971. The reversal of 28364931 is 13946382.

28364931 is a `hidden beast` number, since 2 + 8 + 3 + 649 + 3 + 1 = 666.

It is not a de Polignac number, because 28364931 - 2² = 28364927 is a prime.

It is a super-2 number, since 2×28364931² = 1609138621269522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28364971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41811 + ... + 42483.

It is an arithmetic number, because the mean of its divisors is an integer number (1509760).

Almost surely, 2^28364931 is an apocalyptic number.

28364931 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28364931 is a deficient number, since it is larger than the sum of its proper divisors (19947389).

28364931 is a wasteful number, since it uses less digits than its factorization.

28364931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 906 counting only the distinct ones).

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

The square root of 28364931 is about 5325.8737311356. The cubic root of 28364931 is about 304.9724278578.

The spelling of 28364931 in words is "twenty-eight million, three hundred sixty-four thousand, nine hundred thirty-one".