28387801512 has 96 divisors (see below), whose sum is σ = 91729324800. Its totient is φ = 8110797408.

The previous prime is 28387801511. The next prime is 28387801513. The reversal of 28387801512 is 21510878382.

28387801512 is a `hidden beast` number, since 28 + 38 + 7 + 80 + 1 + 512 = 666.

It is an interprime number because it is at equal distance from previous prime (28387801511) and next prime (28387801513).

It is a super-2 number, since 2×28387801512² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28387801511) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1330488 + ... + 1351655.

It is an arithmetic number, because the mean of its divisors is an integer number (955513800).

Almost surely, 2^28387801512 is an apocalyptic number.

It is an amenable number.

28387801512 is an abundant number, since it is smaller than the sum of its proper divisors (63341523288).

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

28387801512 is a wasteful number, since it uses less digits than its factorization.

28387801512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682172 (or 2682155 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 28387801512 in words is "twenty-eight billion, three hundred eighty-seven million, eight hundred one thousand, five hundred twelve".