28857763638 has 24 divisors (see below), whose sum is σ = 68209259976. Its totient is φ = 8744776800.

The previous prime is 28857763621. The next prime is 28857763651. The reversal of 28857763638 is 83636775882.

It is a happy number.

28857763638 is a `hidden beast` number, since 28 + 8 + 577 + 6 + 3 + 6 + 38 = 666.

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 11 ways as a sum of consecutive naturals, for example, 72872943 + ... + 72873338.

It is an arithmetic number, because the mean of its divisors is an integer number (2842052499).

Almost surely, 2^28857763638 is an apocalyptic number.

28857763638 is an abundant number, since it is smaller than the sum of its proper divisors (39351496338).

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

28857763638 is a wasteful number, since it uses less digits than its factorization.

28857763638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145746300 (or 145746297 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 63.

The spelling of 28857763638 in words is "twenty-eight billion, eight hundred fifty-seven million, seven hundred sixty-three thousand, six hundred thirty-eight".