166891240 has 32 divisors (see below), whose sum is σ = 378005760. Its totient is φ = 66312000.

The previous prime is 166891237. The next prime is 166891247. The reversal of 166891240 is 42198661.

It is a happy number.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 166891240.

It is not an unprimeable number, because it can be changed into a prime (166891247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7776 + ... + 19855.

It is an arithmetic number, because the mean of its divisors is an integer number (11812680).

Almost surely, 2^166891240 is an apocalyptic number.

166891240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166891240 is an abundant number, since it is smaller than the sum of its proper divisors (211114520).

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

166891240 is a wasteful number, since it uses less digits than its factorization.

166891240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27793 (or 27789 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 166891240 is about 12918.6392472272. The cubic root of 166891240 is about 550.5682721506.

The spelling of 166891240 in words is "one hundred sixty-six million, eight hundred ninety-one thousand, two hundred forty".