18105780 has 96 divisors (see below), whose sum is σ = 63221760. Its totient is φ = 3761280.

The previous prime is 18105779. The next prime is 18105797. The reversal of 18105780 is 8750181.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 2661 + ... + 6579.

It is an arithmetic number, because the mean of its divisors is an integer number (658560).

Almost surely, 2^18105780 is an apocalyptic number.

18105780 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 18105780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31610880).

18105780 is an abundant number, since it is smaller than the sum of its proper divisors (45115980).

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

18105780 is a wasteful number, since it uses less digits than its factorization.

18105780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949 (or 3947 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 18105780 is about 4255.0887182290. The cubic root of 18105780 is about 262.5865111682.

The spelling of 18105780 in words is "eighteen million, one hundred five thousand, seven hundred eighty".