28315131 has 16 divisors (see below), whose sum is σ = 40755456. Its totient is φ = 17382816.

The previous prime is 28315117. The next prime is 28315141. The reversal of 28315131 is 13151382.

It is not a de Polignac number, because 28315131 - 2⁵ = 28315099 is a prime.

It is a super-2 number, since 2×28315131² = 1603493287094322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28315141) 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, 26106 + ... + 27168.

It is an arithmetic number, because the mean of its divisors is an integer number (2547216).

Almost surely, 2^28315131 is an apocalyptic number.

28315131 is a deficient number, since it is larger than the sum of its proper divisors (12440325).

28315131 is a wasteful number, since it uses less digits than its factorization.

28315131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762.

The product of its digits is 720, while the sum is 24.

The square root of 28315131 is about 5321.1963880315. The cubic root of 28315131 is about 304.7938443828.

The spelling of 28315131 in words is "twenty-eight million, three hundred fifteen thousand, one hundred thirty-one".