28925631 has 36 divisors (see below), whose sum is σ = 49137192. Its totient is φ = 16347744.

The previous prime is 28925629. The next prime is 28925639. The reversal of 28925631 is 13652982.

28925631 is a `hidden beast` number, since 2 + 8 + 92 + 563 + 1 = 666.

It is not a de Polignac number, because 28925631 - 2¹ = 28925629 is a prime.

It is a super-3 number, since 3×28925631³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28925639) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 46881 + ... + 47493.

It is an arithmetic number, because the mean of its divisors is an integer number (1364922).

Almost surely, 2^28925631 is an apocalyptic number.

28925631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28925631 is a deficient number, since it is larger than the sum of its proper divisors (20211561).

28925631 is a wasteful number, since it uses less digits than its factorization.

28925631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 730 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28925631 is about 5378.2553862754. The cubic root of 28925631 is about 306.9688311645.

The spelling of 28925631 in words is "twenty-eight million, nine hundred twenty-five thousand, six hundred thirty-one".