166708720 has 20 divisors (see below), whose sum is σ = 387597960. Its totient is φ = 66683456.

The previous prime is 166708687. The next prime is 166708741. The reversal of 166708720 is 27807661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 166708720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041850 + ... + 1042009.

It is an arithmetic number, because the mean of its divisors is an integer number (19379898).

Almost surely, 2^166708720 is an apocalyptic number.

166708720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166708720 is an abundant number, since it is smaller than the sum of its proper divisors (220889240).

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

166708720 is a wasteful number, since it uses less digits than its factorization.

166708720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083872 (or 2083866 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 166708720 is about 12911.5731032280. The cubic root of 166708720 is about 550.3674899391.

The spelling of 166708720 in words is "one hundred sixty-six million, seven hundred eight thousand, seven hundred twenty".