189968664 has 16 divisors (see below), whose sum is σ = 474921720. Its totient is φ = 63322880.

The previous prime is 189968663. The next prime is 189968677. The reversal of 189968664 is 466869981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189968663) 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, 3957657 + ... + 3957704.

Almost surely, 2^189968664 is an apocalyptic number.

It is an amenable number.

189968664 is an abundant number, since it is smaller than the sum of its proper divisors (284953056).

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

189968664 is a wasteful number, since it uses less digits than its factorization.

189968664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7915370 (or 7915366 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 57.

The square root of 189968664 is about 13782.9120290307. The cubic root of 189968664 is about 574.8581013430.

The spelling of 189968664 in words is "one hundred eighty-nine million, nine hundred sixty-eight thousand, six hundred sixty-four".