28104177521 has 24 divisors (see below), whose sum is σ = 34329280320. Its totient is φ = 22532919552.

The previous prime is 28104177511. The next prime is 28104177523. The reversal of 28104177521 is 12577140182.

It is not a de Polignac number, because 28104177521 - 2²² = 28099983217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28104177523) 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 23 ways as a sum of consecutive naturals, for example, 287135 + ... + 372363.

It is an arithmetic number, because the mean of its divisors is an integer number (1430386680).

Almost surely, 2^28104177521 is an apocalyptic number.

It is an amenable number.

28104177521 is a deficient number, since it is larger than the sum of its proper divisors (6225102799).

28104177521 is a wasteful number, since it uses less digits than its factorization.

28104177521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85433 (or 85416 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 38.

The spelling of 28104177521 in words is "twenty-eight billion, one hundred four million, one hundred seventy-seven thousand, five hundred twenty-one".