166989280 has 24 divisors (see below), whose sum is σ = 394512552. Its totient is φ = 66795648.

The previous prime is 166989257. The next prime is 166989287. The reversal of 166989280 is 82989661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166989287) by changing a digit.

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, 521682 + ... + 522001.

It is an arithmetic number, because the mean of its divisors is an integer number (16438023).

Almost surely, 2^166989280 is an apocalyptic number.

166989280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166989280 is an abundant number, since it is smaller than the sum of its proper divisors (227523272).

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

166989280 is a wasteful number, since it uses less digits than its factorization.

166989280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043698 (or 1043690 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 166989280 is about 12922.4332074111. The cubic root of 166989280 is about 550.6760612056.

The spelling of 166989280 in words is "one hundred sixty-six million, nine hundred eighty-nine thousand, two hundred eighty".