168688644 has 12 divisors (see below), whose sum is σ = 393606864. Its totient is φ = 56229544.

The previous prime is 168688643. The next prime is 168688651. The reversal of 168688644 is 446886861.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×168688644² = 56911717229117472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168688643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7028682 + ... + 7028705.

It is an arithmetic number, because the mean of its divisors is an integer number (32800572).

Almost surely, 2^168688644 is an apocalyptic number.

It is an amenable number.

168688644 is an abundant number, since it is smaller than the sum of its proper divisors (224918220).

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

168688644 is a wasteful number, since it uses less digits than its factorization.

168688644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14057394 (or 14057392 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 51.

The square root of 168688644 is about 12988.0192485228. The cubic root of 168688644 is about 552.5377426221.

The spelling of 168688644 in words is "one hundred sixty-eight million, six hundred eighty-eight thousand, six hundred forty-four".