187668640 has 24 divisors (see below), whose sum is σ = 443367540. Its totient is φ = 75067392.

The previous prime is 187668631. The next prime is 187668653. The reversal of 187668640 is 46866781.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 178596496 + 9072144 = 13364^2 + 3012^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

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 3 ways as a sum of consecutive naturals, for example, 586305 + ... + 586624.

Almost surely, 2^187668640 is an apocalyptic number.

187668640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

187668640 is an abundant number, since it is smaller than the sum of its proper divisors (255698900).

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

187668640 is a wasteful number, since it uses less digits than its factorization.

187668640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172944 (or 1172936 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 187668640 is about 13699.2204157755. The cubic root of 187668640 is about 572.5286650661.

The spelling of 187668640 in words is "one hundred eighty-seven million, six hundred sixty-eight thousand, six hundred forty".