28328437920 has 48 divisors (see below), whose sum is σ = 89234580960. Its totient is φ = 7554249984.

The previous prime is 28328437913. The next prime is 28328437957. The reversal of 28328437920 is 2973482382.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 28328437920.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29508310 + ... + 29509269.

It is an arithmetic number, because the mean of its divisors is an integer number (1859053770).

Almost surely, 2^28328437920 is an apocalyptic number.

28328437920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28328437920 is an abundant number, since it is smaller than the sum of its proper divisors (60906143040).

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

28328437920 is a wasteful number, since it uses less digits than its factorization.

28328437920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59017597 (or 59017589 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 28328437920 in words is "twenty-eight billion, three hundred twenty-eight million, four hundred thirty-seven thousand, nine hundred twenty".