18977680 has 40 divisors (see below), whose sum is σ = 44443584. Its totient is φ = 7536000.

The previous prime is 18977639. The next prime is 18977723. The reversal of 18977680 is 8677981.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 18977680.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11295 + ... + 12865.

Almost surely, 2^18977680 is an apocalyptic number.

18977680 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 18977680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22221792).

18977680 is an abundant number, since it is smaller than the sum of its proper divisors (25465904).

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

18977680 is a wasteful number, since it uses less digits than its factorization.

18977680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735 (or 1729 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 18977680 is about 4356.3379115950. The cubic root of 18977680 is about 266.7356349389.

The spelling of 18977680 in words is "eighteen million, nine hundred seventy-seven thousand, six hundred eighty".