28720633186 has 64 divisors (see below), whose sum is σ = 52988018688. Its totient is φ = 11408620608.

The previous prime is 28720633181. The next prime is 28720633223. The reversal of 28720633186 is 68133602782.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (28720633181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1750276 + ... + 1766608.

It is an arithmetic number, because the mean of its divisors is an integer number (827937792).

Almost surely, 2^28720633186 is an apocalyptic number.

28720633186 is a deficient number, since it is larger than the sum of its proper divisors (24267385502).

28720633186 is a wasteful number, since it uses less digits than its factorization.

28720633186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16535.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 28720633186 in words is "twenty-eight billion, seven hundred twenty million, six hundred thirty-three thousand, one hundred eighty-six".