18090780 has 96 divisors (see below), whose sum is σ = 54008640. Its totient is φ = 4515840.

The previous prime is 18090773. The next prime is 18090797. The reversal of 18090780 is 8709081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64240 + ... + 64520.

It is an arithmetic number, because the mean of its divisors is an integer number (562590).

Almost surely, 2^18090780 is an apocalyptic number.

18090780 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 18090780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27004320).

18090780 is an abundant number, since it is smaller than the sum of its proper divisors (35917860).

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

18090780 is a wasteful number, since it uses less digits than its factorization.

18090780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 18090780 is about 4253.3257575690. The cubic root of 18090780 is about 262.5139765801.

The spelling of 18090780 in words is "eighteen million, ninety thousand, seven hundred eighty".