18089680 has 40 divisors (see below), whose sum is σ = 48068352. Its totient is φ = 6201984.

The previous prime is 18089677. The next prime is 18089693. The reversal of 18089680 is 8698081.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 15592 + ... + 16711.

Almost surely, 2^18089680 is an apocalyptic number.

18089680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18089680 is an abundant number, since it is smaller than the sum of its proper divisors (29978672).

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

18089680 is a wasteful number, since it uses less digits than its factorization.

18089680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32323 (or 32317 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 18089680 is about 4253.1964450281. The cubic root of 18089680 is about 262.5086557992.

It can be divided in two parts, 18089 and 680, that added together give a square (18769 = 137²).

The spelling of 18089680 in words is "eighteen million, eighty-nine thousand, six hundred eighty".