18722769408 has 320 divisors, whose sum is σ = 63780203520. Its totient is φ = 5312065536.

The previous prime is 18722769397. The next prime is 18722769421. The reversal of 18722769408 is 80496722781.

It is a happy number.

18722769408 is a `hidden beast` number, since 1 + 8 + 7 + 227 + 6 + 9 + 408 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15772591 + ... + 15773777.

It is an arithmetic number, because the mean of its divisors is an integer number (199313136).

Almost surely, 2^18722769408 is an apocalyptic number.

18722769408 is a gapful number since it is divisible by the number (18) 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 18722769408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31890101760).

18722769408 is an abundant number, since it is smaller than the sum of its proper divisors (45057434112).

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

18722769408 is a wasteful number, since it uses less digits than its factorization.

18722769408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384 (or 1362 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 18722769408 in words is "eighteen billion, seven hundred twenty-two million, seven hundred sixty-nine thousand, four hundred eight".