28312121365 has 16 divisors (see below), whose sum is σ = 37067492160. Its totient is φ = 20588216320.

The previous prime is 28312121359. The next prime is 28312121381. The reversal of 28312121365 is 56312121382.

It is not a de Polignac number, because 28312121365 - 2²⁵ = 28278566933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28312121365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539157 + ... + 589333.

It is an arithmetic number, because the mean of its divisors is an integer number (2316718260).

Almost surely, 2^28312121365 is an apocalyptic number.

It is an amenable number.

28312121365 is a deficient number, since it is larger than the sum of its proper divisors (8755370795).

28312121365 is a wasteful number, since it uses less digits than its factorization.

28312121365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60452.

The product of its digits is 17280, while the sum is 34.

The spelling of 28312121365 in words is "twenty-eight billion, three hundred twelve million, one hundred twenty-one thousand, three hundred sixty-five".