18699680 has 48 divisors (see below), whose sum is σ = 44811144. Its totient is φ = 7372800.

The previous prime is 18699647. The next prime is 18699683. The reversal of 18699680 is 8699681.

It can be written as a sum of positive squares in 4 ways, for example, as 18627856 + 71824 = 4316^2 + 268^2 .

It is not an unprimeable number, because it can be changed into a prime (18699683) 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 7 ways as a sum of consecutive naturals, for example, 10880 + ... + 12480.

Almost surely, 2^18699680 is an apocalyptic number.

18699680 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 18699680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22405572).

18699680 is an abundant number, since it is smaller than the sum of its proper divisors (26111464).

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

18699680 is a wasteful number, since it uses less digits than its factorization.

18699680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 1681 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 18699680 is about 4324.3126621464. The cubic root of 18699680 is about 265.4267716895.

Subtracting from 18699680 its reverse (8699681), we obtain a palindrome (9999999).

The spelling of 18699680 in words is "eighteen million, six hundred ninety-nine thousand, six hundred eighty".