18979204728 has 64 divisors (see below), whose sum is σ = 54485769600. Its totient is φ = 5448574080.

The previous prime is 18979204721. The next prime is 18979204729. The reversal of 18979204728 is 82740297981.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18979204721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1886851 + ... + 1896882.

It is an arithmetic number, because the mean of its divisors is an integer number (851340150).

Almost surely, 2^18979204728 is an apocalyptic number.

It is an amenable number.

18979204728 is an abundant number, since it is smaller than the sum of its proper divisors (35506564872).

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

18979204728 is a wasteful number, since it uses less digits than its factorization.

18979204728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3783772 (or 3783768 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 18979204728 in words is "eighteen billion, nine hundred seventy-nine million, two hundred four thousand, seven hundred twenty-eight".