18977884280 has 32 divisors (see below), whose sum is σ = 42744302640. Its totient is φ = 7583320320.

The previous prime is 18977884279. The next prime is 18977884291. The reversal of 18977884280 is 8248877981.

It is a super-2 number, since 2×18977884280² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205469 + ... + 283148.

Almost surely, 2^18977884280 is an apocalyptic number.

18977884280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18977884280 is an abundant number, since it is smaller than the sum of its proper divisors (23766418360).

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

18977884280 is a wasteful number, since it uses less digits than its factorization.

18977884280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489599 (or 489595 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 62.

The spelling of 18977884280 in words is "eighteen billion, nine hundred seventy-seven million, eight hundred eighty-four thousand, two hundred eighty".