18712623520 has 192 divisors, whose sum is σ = 49229661600. Its totient is φ = 6688604160.

The previous prime is 18712623511. The next prime is 18712623551. The reversal of 18712623520 is 2532621781.

It can be written as a sum of positive squares in 16 ways, for example, as 1594564624 + 17118058896 = 39932^2 + 130836^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18712623520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4809736 + ... + 4813624.

Almost surely, 2^18712623520 is an apocalyptic number.

18712623520 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 18712623520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24614830800).

18712623520 is an abundant number, since it is smaller than the sum of its proper divisors (30517038080).

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

18712623520 is a wasteful number, since it uses less digits than its factorization.

18712623520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4011 (or 4003 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 18712623520 in words is "eighteen billion, seven hundred twelve million, six hundred twenty-three thousand, five hundred twenty".