28735681836 has 48 divisors (see below), whose sum is σ = 67886622720. Its totient is φ = 9459756480.

The previous prime is 28735681829. The next prime is 28735681861. The reversal of 28735681836 is 63818653782.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

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, 273490 + ... + 363686.

It is an arithmetic number, because the mean of its divisors is an integer number (1414304640).

Almost surely, 2^28735681836 is an apocalyptic number.

It is an amenable number.

28735681836 is an abundant number, since it is smaller than the sum of its proper divisors (39150940884).

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

28735681836 is a wasteful number, since it uses less digits than its factorization.

28735681836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90534 (or 90532 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 57.

The spelling of 28735681836 in words is "twenty-eight billion, seven hundred thirty-five million, six hundred eighty-one thousand, eight hundred thirty-six".