18448720 has 80 divisors (see below), whose sum is σ = 45568512. Its totient is φ = 6935040.

The previous prime is 18448709. The next prime is 18448739. The reversal of 18448720 is 2784481.

18448720 = 390² + 391² + ... + 485².

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 106554 + ... + 106726.

Almost surely, 2^18448720 is an apocalyptic number.

18448720 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 18448720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22784256).

18448720 is an abundant number, since it is smaller than the sum of its proper divisors (27119792).

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

18448720 is a wasteful number, since it uses less digits than its factorization.

18448720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 18448720 is about 4295.1973179355. The cubic root of 18448720 is about 264.2340287810.

The spelling of 18448720 in words is "eighteen million, four hundred forty-eight thousand, seven hundred twenty".