28507590840 has 32 divisors (see below), whose sum is σ = 85522772880. Its totient is φ = 7602024192.

The previous prime is 28507590821. The next prime is 28507590857. The reversal of 28507590840 is 4809570582.

It is a self number, because there is not a number n which added to its sum of digits gives 28507590840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118781509 + ... + 118781748.

Almost surely, 2^28507590840 is an apocalyptic number.

28507590840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28507590840 is an abundant number, since it is smaller than the sum of its proper divisors (57015182040).

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

28507590840 is a wasteful number, since it uses less digits than its factorization.

28507590840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237563271 (or 237563267 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 28507590840 in words is "twenty-eight billion, five hundred seven million, five hundred ninety thousand, eight hundred forty".