28438598988 has 48 divisors (see below), whose sum is σ = 78066747360. Its totient is φ = 8921912832.

The previous prime is 28438598953. The next prime is 28438598999. The reversal of 28438598988 is 88989583482.

It is a happy number.

28438598988 is a `hidden beast` number, since 2 + 84 + 385 + 98 + 9 + 88 = 666.

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 15 ways as a sum of consecutive naturals, for example, 7742881 + ... + 7746552.

It is an arithmetic number, because the mean of its divisors is an integer number (1626390570).

Almost surely, 2^28438598988 is an apocalyptic number.

It is an amenable number.

28438598988 is an abundant number, since it is smaller than the sum of its proper divisors (49628148372).

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

28438598988 is a wasteful number, since it uses less digits than its factorization.

28438598988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15489463 (or 15489455 counting only the distinct ones).

The product of its digits is 318504960, while the sum is 72.

The spelling of 28438598988 in words is "twenty-eight billion, four hundred thirty-eight million, five hundred ninety-eight thousand, nine hundred eighty-eight".