28885531 has 2 divisors, whose sum is σ = 28885532. Its totient is φ = 28885530.

The previous prime is 28885511. The next prime is 28885541. The reversal of 28885531 is 13558882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28885531 - 2⁷ = 28885403 is a prime.

It is a super-2 number, since 2×28885531² = 1668747802303922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28885501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14442765 + 14442766.

It is an arithmetic number, because the mean of its divisors is an integer number (14442766).

Almost surely, 2^28885531 is an apocalyptic number.

28885531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28885531 is an equidigital number, since it uses as much as digits as its factorization.

28885531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76800, while the sum is 40.

The square root of 28885531 is about 5374.5261186453. The cubic root of 28885531 is about 306.8269138598.

The spelling of 28885531 in words is "twenty-eight million, eight hundred eighty-five thousand, five hundred thirty-one".