18609870724 has 9 divisors (see below), whose sum is σ = 32567751237. Its totient is φ = 9304798944.

The previous prime is 18609870677. The next prime is 18609870737. The reversal of 18609870724 is 42707890681.

The square root of 18609870724 is 136418.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8832616324 + 9777254400 = 93982^2 + 98880^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 238732 + ... + 306940.

Almost surely, 2^18609870724 is an apocalyptic number.

18609870724 is the 136418-th square number.

It is an amenable number.

18609870724 is a deficient number, since it is larger than the sum of its proper divisors (13957880513).

18609870724 is an frugal number, since it uses more digits than its factorization.

18609870724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136422 (or 68211 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 18609870724 in words is "eighteen billion, six hundred nine million, eight hundred seventy thousand, seven hundred twenty-four".