168642920 has 16 divisors (see below), whose sum is σ = 379446660. Its totient is φ = 67457152.

The previous prime is 168642911. The next prime is 168642931. The reversal of 168642920 is 29246861.

It can be written as a sum of positive squares in 2 ways, for example, as 168636196 + 6724 = 12986^2 + 82^2 .

It is a super-2 number, since 2×168642920² = 56880868932252800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2107997 + ... + 2108076.

Almost surely, 2^168642920 is an apocalyptic number.

168642920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168642920 is an abundant number, since it is smaller than the sum of its proper divisors (210803740).

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

168642920 is a wasteful number, since it uses less digits than its factorization.

168642920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4216084 (or 4216080 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 168642920 is about 12986.2588916131. The cubic root of 168642920 is about 552.4878152961.

The spelling of 168642920 in words is "one hundred sixty-eight million, six hundred forty-two thousand, nine hundred twenty".