18907919700 has 108 divisors (see below), whose sum is σ = 54990542880. Its totient is φ = 5016066880.

The previous prime is 18907919689. The next prime is 18907919729. The reversal of 18907919700 is 791970981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 45126091 + ... + 45126509.

Almost surely, 2^18907919700 is an apocalyptic number.

18907919700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18907919700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27495271440).

18907919700 is an abundant number, since it is smaller than the sum of its proper divisors (36082623180).

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

18907919700 is a wasteful number, since it uses less digits than its factorization.

18907919700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 51.

The spelling of 18907919700 in words is "eighteen billion, nine hundred seven million, nine hundred nineteen thousand, seven hundred".