168987664 has 10 divisors (see below), whose sum is σ = 327413630. Its totient is φ = 84493824.

The previous prime is 168987659. The next prime is 168987697. The reversal of 168987664 is 466789861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 120824064 + 48163600 = 10992^2 + 6940^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280849 + ... + 5280880.

It is an arithmetic number, because the mean of its divisors is an integer number (32741363).

Almost surely, 2^168987664 is an apocalyptic number.

It is an amenable number.

168987664 is a deficient number, since it is larger than the sum of its proper divisors (158425966).

168987664 is a wasteful number, since it uses less digits than its factorization.

168987664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561737 (or 10561731 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 55.

The square root of 168987664 is about 12999.5255298030. The cubic root of 168987664 is about 552.8640287790.

The spelling of 168987664 in words is "one hundred sixty-eight million, nine hundred eighty-seven thousand, six hundred sixty-four".