28814931 has 12 divisors (see below), whose sum is σ = 41693808. Its totient is φ = 19176624.

The previous prime is 28814927. The next prime is 28814953. The reversal of 28814931 is 13941882.

It is not a de Polignac number, because 28814931 - 2² = 28814927 is a prime.

It is a super-2 number, since 2×28814931² = 1660600497069522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28814921) 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, 3426 + ... + 8328.

It is an arithmetic number, because the mean of its divisors is an integer number (3474484).

Almost surely, 2^28814931 is an apocalyptic number.

28814931 is a deficient number, since it is larger than the sum of its proper divisors (12878877).

28814931 is a wasteful number, since it uses less digits than its factorization.

28814931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5562 (or 5559 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 28814931 is about 5367.9540795353. The cubic root of 28814931 is about 306.5767349455.

The spelling of 28814931 in words is "twenty-eight million, eight hundred fourteen thousand, nine hundred thirty-one".