166890380 has 24 divisors (see below), whose sum is σ = 353944080. Its totient is φ = 66094400.

The previous prime is 166890359. The next prime is 166890407. The reversal of 166890380 is 83098661.

It is a happy number.

166890380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39290 + ... + 43329.

It is an arithmetic number, because the mean of its divisors is an integer number (14747670).

Almost surely, 2^166890380 is an apocalyptic number.

166890380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166890380 is an abundant number, since it is smaller than the sum of its proper divisors (187053700).

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

166890380 is a wasteful number, since it uses less digits than its factorization.

166890380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82729 (or 82727 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 166890380 is about 12918.6059619450. The cubic root of 166890380 is about 550.5673264458.

The spelling of 166890380 in words is "one hundred sixty-six million, eight hundred ninety thousand, three hundred eighty".