18684501928 has 8 divisors (see below), whose sum is σ = 35033441130. Its totient is φ = 9342250960.

The previous prime is 18684501917. The next prime is 18684501937. The reversal of 18684501928 is 82910548681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17774755684 + 909746244 = 133322^2 + 30162^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18684501928² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1167781363 + ... + 1167781378.

Almost surely, 2^18684501928 is an apocalyptic number.

It is an amenable number.

18684501928 is a deficient number, since it is larger than the sum of its proper divisors (16348939202).

18684501928 is a wasteful number, since it uses less digits than its factorization.

18684501928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335562747 (or 2335562743 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 52.

The spelling of 18684501928 in words is "eighteen billion, six hundred eighty-four million, five hundred one thousand, nine hundred twenty-eight".