18784633880 has 16 divisors (see below), whose sum is σ = 42265426320. Its totient is φ = 7513853536.

The previous prime is 18784633873. The next prime is 18784633883. The reversal of 18784633880 is 8833648781.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18784633883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234807884 + ... + 234807963.

It is an arithmetic number, because the mean of its divisors is an integer number (2641589145).

Almost surely, 2^18784633880 is an apocalyptic number.

18784633880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18784633880 is an abundant number, since it is smaller than the sum of its proper divisors (23480792440).

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

18784633880 is a wasteful number, since it uses less digits than its factorization.

18784633880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469615858 (or 469615854 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 18784633880 in words is "eighteen billion, seven hundred eighty-four million, six hundred thirty-three thousand, eight hundred eighty".