18378634000 has 160 divisors (see below), whose sum is σ = 46629872640. Its totient is φ = 6996416000.

The previous prime is 18378633979. The next prime is 18378634003. The reversal of 18378634000 is 43687381.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (18378634003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4115769 + ... + 4120231.

It is an arithmetic number, because the mean of its divisors is an integer number (291436704).

Almost surely, 2^18378634000 is an apocalyptic number.

18378634000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18378634000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23314936320).

18378634000 is an abundant number, since it is smaller than the sum of its proper divisors (28251238640).

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

18378634000 is a wasteful number, since it uses less digits than its factorization.

18378634000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4586 (or 4570 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 18378634000 in words is "eighteen billion, three hundred seventy-eight million, six hundred thirty-four thousand".