28904190868 has 24 divisors (see below), whose sum is σ = 57812227200. Its totient is φ = 12386686368.

The previous prime is 28904190851. The next prime is 28904190869. The reversal of 28904190868 is 86809140982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904190869) 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, 599193 + ... + 645631.

It is an arithmetic number, because the mean of its divisors is an integer number (2408842800).

Almost surely, 2^28904190868 is an apocalyptic number.

28904190868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28904190868 is an abundant number, since it is smaller than the sum of its proper divisors (28908036332).

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

28904190868 is a wasteful number, since it uses less digits than its factorization.

28904190868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68679 (or 68677 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 55.

The spelling of 28904190868 in words is "twenty-eight billion, nine hundred four million, one hundred ninety thousand, eight hundred sixty-eight".