168561864 has 32 divisors (see below), whose sum is σ = 468228000. Its totient is φ = 56187216.

The previous prime is 168561857. The next prime is 168561929. The reversal of 168561864 is 468165861.

168561864 is a `hidden beast` number, since 1 + 6 + 8 + 561 + 86 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389974 + ... + 390405.

It is an arithmetic number, because the mean of its divisors is an integer number (14632125).

Almost surely, 2^168561864 is an apocalyptic number.

It is an amenable number.

168561864 is an abundant number, since it is smaller than the sum of its proper divisors (299666136).

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

168561864 is a wasteful number, since it uses less digits than its factorization.

168561864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780394 (or 780384 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 168561864 is about 12983.1376793131. The cubic root of 168561864 is about 552.3992857787.

The spelling of 168561864 in words is "one hundred sixty-eight million, five hundred sixty-one thousand, eight hundred sixty-four".