28838731 has 12 divisors (see below), whose sum is σ = 30478032. Its totient is φ = 27276704.

The previous prime is 28838701. The next prime is 28838737. The reversal of 28838731 is 13783882.

It is not a de Polignac number, because 28838731 - 2⁵ = 28838699 is a prime.

It is a super-2 number, since 2×28838731² = 1663344811380722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28838737) 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, 44250 + ... + 44896.

It is an arithmetic number, because the mean of its divisors is an integer number (2539836).

Almost surely, 2^28838731 is an apocalyptic number.

28838731 is a deficient number, since it is larger than the sum of its proper divisors (1639301).

28838731 is an equidigital number, since it uses as much as digits as its factorization.

28838731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758 (or 729 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 28838731 is about 5370.1704814652. The cubic root of 28838731 is about 306.6611184934.

The spelling of 28838731 in words is "twenty-eight million, eight hundred thirty-eight thousand, seven hundred thirty-one".