168689432 has 8 divisors (see below), whose sum is σ = 316292700. Its totient is φ = 84344712.

The previous prime is 168689431. The next prime is 168689441. The reversal of 168689432 is 234986861.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×168689432² = 56912248936965248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168689431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10543082 + ... + 10543097.

Almost surely, 2^168689432 is an apocalyptic number.

It is an amenable number.

168689432 is a deficient number, since it is larger than the sum of its proper divisors (147603268).

168689432 is a wasteful number, since it uses less digits than its factorization.

168689432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21086185 (or 21086181 counting only the distinct ones).

The product of its digits is 497664, while the sum is 47.

The square root of 168689432 is about 12988.0495841370. The cubic root of 168689432 is about 552.5386029824.

The spelling of 168689432 in words is "one hundred sixty-eight million, six hundred eighty-nine thousand, four hundred thirty-two".