166688628 has 24 divisors (see below), whose sum is σ = 390352032. Its totient is φ = 55361184.

The previous prime is 166688623. The next prime is 166688633. The reversal of 166688628 is 826886661.

It is an interprime number because it is at equal distance from previous prime (166688623) and next prime (166688633).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166688623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21750 + ... + 28397.

It is an arithmetic number, because the mean of its divisors is an integer number (16264668).

Almost surely, 2^166688628 is an apocalyptic number.

It is an amenable number.

166688628 is an abundant number, since it is smaller than the sum of its proper divisors (223663404).

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

166688628 is a wasteful number, since it uses less digits than its factorization.

166688628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50431 (or 50429 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The square root of 166688628 is about 12910.7950181234. The cubic root of 166688628 is about 550.3453786625.

The spelling of 166688628 in words is "one hundred sixty-six million, six hundred eighty-eight thousand, six hundred twenty-eight".