166909428 has 36 divisors (see below), whose sum is σ = 482183520. Its totient is φ = 47688336.

The previous prime is 166909423. The next prime is 166909439. The reversal of 166909428 is 824909661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166909423) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 330918 + ... + 331421.

Almost surely, 2^166909428 is an apocalyptic number.

166909428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

166909428 is an abundant number, since it is smaller than the sum of its proper divisors (315274092).

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

166909428 is a wasteful number, since it uses less digits than its factorization.

166909428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662356 (or 662351 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 166909428 is about 12919.3431721586. The cubic root of 166909428 is about 550.5882719460.

The spelling of 166909428 in words is "one hundred sixty-six million, nine hundred nine thousand, four hundred twenty-eight".