18255680 has 56 divisors (see below), whose sum is σ = 44028360. Its totient is φ = 7208960.

The previous prime is 18255659. The next prime is 18255707. The reversal of 18255680 is 8655281.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2637376 + 15618304 = 1624^2 + 3952^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18255680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28160 + ... + 28800.

Almost surely, 2^18255680 is an apocalyptic number.

18255680 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 18255680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22014180).

18255680 is an abundant number, since it is smaller than the sum of its proper divisors (25772680).

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

18255680 is an equidigital number, since it uses as much as digits as its factorization.

18255680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 18255680 is about 4272.6666146565. Note that the first 4 decimals coincide. The cubic root of 18255680 is about 263.3091825668.

The spelling of 18255680 in words is "eighteen million, two hundred fifty-five thousand, six hundred eighty".