189771648 has 64 divisors (see below), whose sum is σ = 549918720. Its totient is φ = 57505280.

The previous prime is 189771611. The next prime is 189771661. The reversal of 189771648 is 846177981.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 189771648.

It is a congruent number.

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, 18240 + ... + 26687.

It is an arithmetic number, because the mean of its divisors is an integer number (8592480).

Almost surely, 2^189771648 is an apocalyptic number.

It is an amenable number.

189771648 is an abundant number, since it is smaller than the sum of its proper divisors (360147072).

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

189771648 is a wasteful number, since it uses less digits than its factorization.

189771648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44955 (or 44943 counting only the distinct ones).

The product of its digits is 677376, while the sum is 51.

The square root of 189771648 is about 13775.7630641645. The cubic root of 189771648 is about 574.6593046635.

The spelling of 189771648 in words is "one hundred eighty-nine million, seven hundred seventy-one thousand, six hundred forty-eight".