28131535 has 12 divisors (see below), whose sum is σ = 34611624. Its totient is φ = 21949760.

The previous prime is 28131527. The next prime is 28131541. The reversal of 28131535 is 53513182.

It is not a de Polignac number, because 28131535 - 2³ = 28131527 is a prime.

It is a super-2 number, since 2×28131535² = 1582766522912450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6732 + ... + 10078.

It is an arithmetic number, because the mean of its divisors is an integer number (2884302).

Almost surely, 2^28131535 is an apocalyptic number.

28131535 is a deficient number, since it is larger than the sum of its proper divisors (6480089).

28131535 is an equidigital number, since it uses as much as digits as its factorization.

28131535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434 (or 3393 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 28131535 is about 5303.9169488219. The cubic root of 28131535 is about 304.1336518450.

The spelling of 28131535 in words is "twenty-eight million, one hundred thirty-one thousand, five hundred thirty-five".