28631 has 2 divisors, whose sum is σ = 28632. Its totient is φ = 28630.

The previous prime is 28627. The next prime is 28643. The reversal of 28631 is 13682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28631 - 2² = 28627 is a prime.

It is a super-2 number, since 2×28631² = 1639468322, which contains 22 as substring.

It is a plaindrome in base 12.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14315 + 14316.

It is an arithmetic number, because the mean of its divisors is an integer number (14316).

2²⁸⁶³¹ is an apocalyptic number.

28631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28631 is an equidigital number, since it uses as much as digits as its factorization.

28631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 28631 is about 169.2069738516. The cubic root of 28631 is about 30.5923030180.

The spelling of 28631 in words is "twenty-eight thousand, six hundred thirty-one".