28329131 has 4 divisors (see below), whose sum is σ = 28987992. Its totient is φ = 27670272.

The previous prime is 28329127. The next prime is 28329137. The reversal of 28329131 is 13192382.

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 28329131 - 2² = 28329127 is a prime.

It is a super-2 number, since 2×28329131² = 1605079326430322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28329094 and 28329103.

It is not an unprimeable number, because it can be changed into a prime (28329137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329366 + ... + 329451.

It is an arithmetic number, because the mean of its divisors is an integer number (7246998).

Almost surely, 2^28329131 is an apocalyptic number.

28329131 is a deficient number, since it is larger than the sum of its proper divisors (658861).

28329131 is an equidigital number, since it uses as much as digits as its factorization.

28329131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658860.

The product of its digits is 2592, while the sum is 29.

The square root of 28329131 is about 5322.5117191041. The cubic root of 28329131 is about 304.8440697169.

The spelling of 28329131 in words is "twenty-eight million, three hundred twenty-nine thousand, one hundred thirty-one".