28319131 has 8 divisors (see below), whose sum is σ = 28905984. Its totient is φ = 27737640.

The previous prime is 28319117. The next prime is 28319147. The reversal of 28319131 is 13191382.

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

It is a cyclic number.

It is not a de Polignac number, because 28319131 - 2⁵ = 28319099 is a prime.

It is a super-2 number, since 2×28319131² = 1603946361190322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28319131.

It is not an unprimeable number, because it can be changed into a prime (28319191) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10350 + ... + 12796.

It is an arithmetic number, because the mean of its divisors is an integer number (3613248).

Almost surely, 2^28319131 is an apocalyptic number.

28319131 is the 2845-th centered heptagonal number.

28319131 is a deficient number, since it is larger than the sum of its proper divisors (586853).

28319131 is a wasteful number, since it uses less digits than its factorization.

28319131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681.

The product of its digits is 1296, while the sum is 28.

The square root of 28319131 is about 5321.5722300839. The cubic root of 28319131 is about 304.8081961673.

The spelling of 28319131 in words is "twenty-eight million, three hundred nineteen thousand, one hundred thirty-one".