18790780 has 36 divisors (see below), whose sum is σ = 41931288. Its totient is φ = 7072000.

The previous prime is 18790777. The next prime is 18790787. The reversal of 18790780 is 8709781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18790787) 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, 4155 + ... + 7405.

It is an arithmetic number, because the mean of its divisors is an integer number (1164758).

Almost surely, 2^18790780 is an apocalyptic number.

18790780 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 18790780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20965644).

18790780 is an abundant number, since it is smaller than the sum of its proper divisors (23140508).

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

18790780 is a wasteful number, since it uses less digits than its factorization.

18790780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294 (or 3275 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 18790780 is about 4334.8333301293. The cubic root of 18790780 is about 265.8571037947.

The spelling of 18790780 in words is "eighteen million, seven hundred ninety thousand, seven hundred eighty".