188764640 has 24 divisors (see below), whose sum is σ = 445956840. Its totient is φ = 75505792.

The previous prime is 188764627. The next prime is 188764663. The reversal of 188764640 is 46467881.

It is a junction number, because it is equal to n+sod(n) for n = 188764591 and 188764600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589730 + ... + 590049.

It is an arithmetic number, because the mean of its divisors is an integer number (18581535).

Almost surely, 2^188764640 is an apocalyptic number.

188764640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188764640 is an abundant number, since it is smaller than the sum of its proper divisors (257192200).

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

188764640 is a wasteful number, since it uses less digits than its factorization.

188764640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179794 (or 1179786 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 188764640 is about 13739.1644578555. The cubic root of 188764640 is about 573.6410402811.

The spelling of 188764640 in words is "one hundred eighty-eight million, seven hundred sixty-four thousand, six hundred forty".