18878720 has 144 divisors (see below), whose sum is σ = 53961600. Its totient is φ = 6322176.

The previous prime is 18878719. The next prime is 18878771. The reversal of 18878720 is 2787881.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439019 + ... + 439061.

Almost surely, 2^18878720 is an apocalyptic number.

18878720 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 18878720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26980800).

18878720 is an abundant number, since it is smaller than the sum of its proper divisors (35082880).

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

18878720 is an frugal number, since it uses more digits than its factorization.

18878720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 18878720 is about 4344.9649020447. The cubic root of 18878720 is about 266.2711915656.

The spelling of 18878720 in words is "eighteen million, eight hundred seventy-eight thousand, seven hundred twenty".