28658631 has 16 divisors (see below), whose sum is σ = 41207040. Its totient is φ = 17657280.

The previous prime is 28658599. The next prime is 28658633. The reversal of 28658631 is 13685682.

It is a happy number.

It is not a de Polignac number, because 28658631 - 2⁵ = 28658599 is a prime.

It is a super-2 number, since 2×28658631² = 1642634261588322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28658631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28658633) 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, 3795 + ... + 8468.

It is an arithmetic number, because the mean of its divisors is an integer number (2575440).

Almost surely, 2^28658631 is an apocalyptic number.

28658631 is a deficient number, since it is larger than the sum of its proper divisors (12548409).

28658631 is a wasteful number, since it uses less digits than its factorization.

28658631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12326.

The product of its digits is 69120, while the sum is 39.

The square root of 28658631 is about 5353.3756640086. The cubic root of 28658631 is about 306.0214112063.

The spelling of 28658631 in words is "twenty-eight million, six hundred fifty-eight thousand, six hundred thirty-one".