188680640 has 56 divisors (see below), whose sum is σ = 472958160. Its totient is φ = 71497728.

The previous prime is 188680627. The next prime is 188680651. The reversal of 188680640 is 46086881.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9437 + ... + 21596.

Almost surely, 2^188680640 is an apocalyptic number.

188680640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188680640 is an abundant number, since it is smaller than the sum of its proper divisors (284277520).

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

188680640 is a wasteful number, since it uses less digits than its factorization.

188680640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31069 (or 31059 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 188680640 is about 13736.1071632395. The cubic root of 188680640 is about 573.5559378370. Note that the first 3 decimals are identical.

The spelling of 188680640 in words is "one hundred eighty-eight million, six hundred eighty thousand, six hundred forty".