28312121179 has 32 divisors (see below), whose sum is σ = 30904473600. Its totient is φ = 25850689920.

The previous prime is 28312121171. The next prime is 28312121197. The reversal of 28312121179 is 97112121382.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28312121179 - 2³ = 28312121171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28312121171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17617194 + ... + 17618800.

It is an arithmetic number, because the mean of its divisors is an integer number (965764800).

Almost surely, 2^28312121179 is an apocalyptic number.

28312121179 is a deficient number, since it is larger than the sum of its proper divisors (2592352421).

28312121179 is a wasteful number, since it uses less digits than its factorization.

28312121179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963.

The product of its digits is 12096, while the sum is 37.

The spelling of 28312121179 in words is "twenty-eight billion, three hundred twelve million, one hundred twenty-one thousand, one hundred seventy-nine".