28877531 has 2 divisors, whose sum is σ = 28877532. Its totient is φ = 28877530.

The previous prime is 28877507. The next prime is 28877557. The reversal of 28877531 is 13577882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28877531 - 2²² = 24683227 is a prime.

It is a super-2 number, since 2×28877531² = 1667823593311922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28877561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14438765 + 14438766.

It is an arithmetic number, because the mean of its divisors is an integer number (14438766).

Almost surely, 2^28877531 is an apocalyptic number.

28877531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28877531 is an equidigital number, since it uses as much as digits as its factorization.

28877531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 41.

The square root of 28877531 is about 5373.7818154443. The cubic root of 28877531 is about 306.7985854676.

The spelling of 28877531 in words is "twenty-eight million, eight hundred seventy-seven thousand, five hundred thirty-one".