18678264640 has 112 divisors (see below), whose sum is σ = 53507030400. Its totient is φ = 6066911232.

The previous prime is 18678264629. The next prime is 18678264641. The reversal of 18678264640 is 4646287681.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18678264641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176875 + ... + 261994.

Almost surely, 2^18678264640 is an apocalyptic number.

18678264640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18678264640 is an abundant number, since it is smaller than the sum of its proper divisors (34828765760).

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

18678264640 is a wasteful number, since it uses less digits than its factorization.

18678264640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438912 (or 438902 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 18678264640 in words is "eighteen billion, six hundred seventy-eight million, two hundred sixty-four thousand, six hundred forty".