18290720 has 72 divisors (see below), whose sum is σ = 50288364. Its totient is φ = 6268416.

The previous prime is 18290707. The next prime is 18290761. The reversal of 18290720 is 2709281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17875984 + 414736 = 4228^2 + 644^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6674 + ... + 9006.

Almost surely, 2^18290720 is an apocalyptic number.

18290720 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 18290720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25144182).

18290720 is an abundant number, since it is smaller than the sum of its proper divisors (31997644).

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

18290720 is a wasteful number, since it uses less digits than its factorization.

18290720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362 (or 2347 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18290720 is about 4276.7651326674. The cubic root of 18290720 is about 263.4775403421.

The spelling of 18290720 in words is "eighteen million, two hundred ninety thousand, seven hundred twenty".