28090131 has 4 divisors (see below), whose sum is σ = 37453512. Its totient is φ = 18726752.

The previous prime is 28090121. The next prime is 28090147. The reversal of 28090131 is 13109082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28090131 - 2⁵ = 28090099 is a prime.

It is a super-2 number, since 2×28090131² = 1578110919194322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28090121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4681686 + ... + 4681691.

It is an arithmetic number, because the mean of its divisors is an integer number (9363378).

Almost surely, 2^28090131 is an apocalyptic number.

28090131 is a deficient number, since it is larger than the sum of its proper divisors (9363381).

28090131 is an equidigital number, since it uses as much as digits as its factorization.

28090131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9363380.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 28090131 is about 5300.0123584762. The cubic root of 28090131 is about 303.9843705896.

The spelling of 28090131 in words is "twenty-eight million, ninety thousand, one hundred thirty-one".