28131408373 has 4 divisors (see below), whose sum is σ = 28470341088. Its totient is φ = 27792475660.

The previous prime is 28131408367. The next prime is 28131408377. The reversal of 28131408373 is 37380413182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28131408373 - 2²⁵ = 28097853941 is a prime.

It is a super-2 number, since 2×28131408373² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131408377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169466233 + ... + 169466398.

It is an arithmetic number, because the mean of its divisors is an integer number (7117585272).

Almost surely, 2^28131408373 is an apocalyptic number.

It is an amenable number.

28131408373 is a deficient number, since it is larger than the sum of its proper divisors (338932715).

28131408373 is an equidigital number, since it uses as much as digits as its factorization.

28131408373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338932714.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 28131408373 in words is "twenty-eight billion, one hundred thirty-one million, four hundred eight thousand, three hundred seventy-three".