18536780 has 24 divisors (see below), whose sum is σ = 40976880. Its totient is φ = 7024320.

The previous prime is 18536779. The next prime is 18536789. The reversal of 18536780 is 8763581.

It is a super-2 number, since 2×18536780² = 687224425536800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18536789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24011 + ... + 24770.

It is an arithmetic number, because the mean of its divisors is an integer number (1707370).

Almost surely, 2^18536780 is an apocalyptic number.

18536780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18536780 is an abundant number, since it is smaller than the sum of its proper divisors (22440100).

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

18536780 is a wasteful number, since it uses less digits than its factorization.

18536780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48809 (or 48807 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 18536780 is about 4305.4360987013. The cubic root of 18536780 is about 264.6537783092.

The spelling of 18536780 in words is "eighteen million, five hundred thirty-six thousand, seven hundred eighty".