18720064 has 28 divisors (see below), whose sum is σ = 40526208. Its totient is φ = 8508800.

The previous prime is 18719983. The next prime is 18720083. The reversal of 18720064 is 46002781.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12592 + ... + 13999.

Almost surely, 2^18720064 is an apocalyptic number.

It is an amenable number.

18720064 is an abundant number, since it is smaller than the sum of its proper divisors (21806144).

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

18720064 is a wasteful number, since it uses less digits than its factorization.

18720064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26614 (or 26604 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 18720064 is about 4326.6689265531. The cubic root of 18720064 is about 265.5231814422.

The spelling of 18720064 in words is "eighteen million, seven hundred twenty thousand, sixty-four".