18098280 has 48 divisors (see below), whose sum is σ = 58820580. Its totient is φ = 4826112.

The previous prime is 18098257. The next prime is 18098287. The reversal of 18098280 is 8289081.

It can be written as a sum of positive squares in 2 ways, for example, as 18096516 + 1764 = 4254^2 + 42^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18098287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24777 + ... + 25496.

Almost surely, 2^18098280 is an apocalyptic number.

18098280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18098280 is an abundant number, since it is smaller than the sum of its proper divisors (40722300).

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

18098280 is a wasteful number, since it uses less digits than its factorization.

18098280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50290 (or 50283 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 18098280 is about 4254.2073292213. The cubic root of 18098280 is about 262.5502488839.

The spelling of 18098280 in words is "eighteen million, ninety-eight thousand, two hundred eighty".