28306131 has 16 divisors (see below), whose sum is σ = 44525568. Its totient is φ = 15652800.

The previous prime is 28306129. The next prime is 28306153. The reversal of 28306131 is 13160382.

It is not a de Polignac number, because 28306131 - 2¹ = 28306129 is a prime.

It is a super-2 number, since 2×28306131² = 1602474104378322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28306111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21090 + ... + 22391.

It is an arithmetic number, because the mean of its divisors is an integer number (2782848).

Almost surely, 2^28306131 is an apocalyptic number.

28306131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28306131 is a deficient number, since it is larger than the sum of its proper divisors (16219437).

28306131 is a wasteful number, since it uses less digits than its factorization.

28306131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43522.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 28306131 is about 5320.3506463390. The cubic root of 28306131 is about 304.7615479252.

The spelling of 28306131 in words is "twenty-eight million, three hundred six thousand, one hundred thirty-one".