18697220928 has 84 divisors (see below), whose sum is σ = 55577150720. Its totient is φ = 6232401792.

The previous prime is 18697220923. The next prime is 18697220977. The reversal of 18697220928 is 82902279681.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18697220923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 585568 + ... + 616671.

Almost surely, 2^18697220928 is an apocalyptic number.

18697220928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18697220928 is an abundant number, since it is smaller than the sum of its proper divisors (36879929792).

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

18697220928 is an equidigital number, since it uses as much as digits as its factorization.

18697220928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202266 (or 1202244 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 18697220928 in words is "eighteen billion, six hundred ninety-seven million, two hundred twenty thousand, nine hundred twenty-eight".