18696780 has 72 divisors (see below), whose sum is σ = 57081024. Its totient is φ = 4953600.

The previous prime is 18696773. The next prime is 18696781. The reversal of 18696780 is 8769681.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (18696781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43165 + ... + 43595.

It is an arithmetic number, because the mean of its divisors is an integer number (792792).

Almost surely, 2^18696780 is an apocalyptic number.

18696780 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 18696780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28540512).

18696780 is an abundant number, since it is smaller than the sum of its proper divisors (38384244).

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

18696780 is a wasteful number, since it uses less digits than its factorization.

18696780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687 (or 682 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 18696780 is about 4323.9773357408. The cubic root of 18696780 is about 265.4130499318.

It can be divided in two parts, 1869 and 6780, that added together give a square (8649 = 93²).

The spelling of 18696780 in words is "eighteen million, six hundred ninety-six thousand, seven hundred eighty".