28221176904 has 32 divisors (see below), whose sum is σ = 71067935520. Its totient is φ = 9338393216.

The previous prime is 28221176903. The next prime is 28221176909. The reversal of 28221176904 is 40967112282.

It is not an unprimeable number, because it can be changed into a prime (28221176903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4288254 + ... + 4294829.

It is an arithmetic number, because the mean of its divisors is an integer number (2220872985).

Almost surely, 2^28221176904 is an apocalyptic number.

28221176904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28221176904 is an abundant number, since it is smaller than the sum of its proper divisors (42846758616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28221176904 is a wasteful number, since it uses less digits than its factorization.

28221176904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8583229 (or 8583225 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 28221176904 in words is "twenty-eight billion, two hundred twenty-one million, one hundred seventy-six thousand, nine hundred four".