28187847828 has 48 divisors (see below), whose sum is σ = 83519551360. Its totient is φ = 8053670592.

The previous prime is 28187847797. The next prime is 28187847851. The reversal of 28187847828 is 82874878182.

28187847828 is a `hidden beast` number, since 2 + 81 + 87 + 8 + 478 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

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, 18642001 + ... + 18643512.

Almost surely, 2^28187847828 is an apocalyptic number.

28187847828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28187847828 is an abundant number, since it is smaller than the sum of its proper divisors (55331703532).

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

28187847828 is a wasteful number, since it uses less digits than its factorization.

28187847828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37285533 (or 37285525 counting only the distinct ones).

The product of its digits is 25690112, while the sum is 63.

The spelling of 28187847828 in words is "twenty-eight billion, one hundred eighty-seven million, eight hundred forty-seven thousand, eight hundred twenty-eight".