28552731 has 16 divisors (see below), whose sum is σ = 39177600. Its totient is φ = 18486720.

The previous prime is 28552703. The next prime is 28552739. The reversal of 28552731 is 13725582.

It is not a de Polignac number, because 28552731 - 2⁷ = 28552603 is a prime.

It is a super-2 number, since 2×28552731² = 1630516895116722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28552692 and 28552701.

It is not an unprimeable number, because it can be changed into a prime (28552739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26695 + ... + 27743.

It is an arithmetic number, because the mean of its divisors is an integer number (2448600).

Almost surely, 2^28552731 is an apocalyptic number.

28552731 is a deficient number, since it is larger than the sum of its proper divisors (10624869).

28552731 is a wasteful number, since it uses less digits than its factorization.

28552731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306.

The product of its digits is 16800, while the sum is 33.

The square root of 28552731 is about 5343.4755543560. The cubic root of 28552731 is about 305.6440069561.

The spelling of 28552731 in words is "twenty-eight million, five hundred fifty-two thousand, seven hundred thirty-one".