28591251720 has 64 divisors (see below), whose sum is σ = 86575417920. Its totient is φ = 7553074944.

The previous prime is 28591251719. The next prime is 28591251739. The reversal of 28591251720 is 2715219582.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1100527 + ... + 1126206.

It is an arithmetic number, because the mean of its divisors is an integer number (1352740905).

Almost surely, 2^28591251720 is an apocalyptic number.

28591251720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28591251720 is an abundant number, since it is smaller than the sum of its proper divisors (57984166200).

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

28591251720 is a wasteful number, since it uses less digits than its factorization.

28591251720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226854 (or 2226850 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 42.

The spelling of 28591251720 in words is "twenty-eight billion, five hundred ninety-one million, two hundred fifty-one thousand, seven hundred twenty".