28000131 has 8 divisors (see below), whose sum is σ = 38956800. Its totient is φ = 17855112.

The previous prime is 28000123. The next prime is 28000151. The reversal of 28000131 is 13100082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28000131 - 2³ = 28000123 is a prime.

It is a super-2 number, since 2×28000131² = 1568014672034322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28000131.

It is not an unprimeable number, because it can be changed into a prime (28000121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202831 + ... + 202968.

It is an arithmetic number, because the mean of its divisors is an integer number (4869600).

Almost surely, 2^28000131 is an apocalyptic number.

28000131 is a deficient number, since it is larger than the sum of its proper divisors (10956669).

28000131 is a wasteful number, since it uses less digits than its factorization.

28000131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405825.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 28000131 is about 5291.5150004512. The cubic root of 28000131 is about 303.6593707501.

The spelling of 28000131 in words is "twenty-eight million, one hundred thirty-one", and thus it is an aban number.