28750131 has 6 divisors (see below), whose sum is σ = 41527980. Its totient is φ = 19166748.

The previous prime is 28750129. The next prime is 28750157. The reversal of 28750131 is 13105782.

It is not a de Polignac number, because 28750131 - 2¹ = 28750129 is a prime.

It is a super-2 number, since 2×28750131² = 1653140065034322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28750095 and 28750104.

It is not an unprimeable number, because it can be changed into a prime (28750031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1597221 + ... + 1597238.

It is an arithmetic number, because the mean of its divisors is an integer number (6921330).

Almost surely, 2^28750131 is an apocalyptic number.

28750131 is a deficient number, since it is larger than the sum of its proper divisors (12777849).

28750131 is a wasteful number, since it uses less digits than its factorization.

28750131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194465 (or 3194462 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 28750131 is about 5361.9148631809. The cubic root of 28750131 is about 306.3467490519.

The spelling of 28750131 in words is "twenty-eight million, seven hundred fifty thousand, one hundred thirty-one".