18709278720 has 832 divisors, whose sum is σ = 72468725760. Its totient is φ = 4069785600.

The previous prime is 18709278691. The next prime is 18709278743. The reversal of 18709278720 is 2787290781.

It is a happy number.

It is a super-2 number, since 2×18709278720² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 398069737 + ... + 398069783.

Almost surely, 2^18709278720 is an apocalyptic number.

18709278720 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 18709278720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36234362880).

18709278720 is an abundant number, since it is smaller than the sum of its proper divisors (53759447040).

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

18709278720 is a wasteful number, since it uses less digits than its factorization.

18709278720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 51.

The spelling of 18709278720 in words is "eighteen billion, seven hundred nine million, two hundred seventy-eight thousand, seven hundred twenty".