18640627236 has 576 divisors, whose sum is σ = 65415168000. Its totient is φ = 4419878400.

The previous prime is 18640627223. The next prime is 18640627259. The reversal of 18640627236 is 63272604681.

18640627236 is a `hidden beast` number, since 1 + 8 + 6 + 406 + 2 + 7 + 236 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18640627191 and 18640627200.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 80002576 + ... + 80002808.

It is an arithmetic number, because the mean of its divisors is an integer number (113568000).

Almost surely, 2^18640627236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18640627236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32707584000).

18640627236 is an abundant number, since it is smaller than the sum of its proper divisors (46774540764).

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

18640627236 is a wasteful number, since it uses less digits than its factorization.

18640627236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 18640627236 in words is "eighteen billion, six hundred forty million, six hundred twenty-seven thousand, two hundred thirty-six".