189172768 has 24 divisors (see below), whose sum is σ = 377153280. Its totient is φ = 93387840.

The previous prime is 189172727. The next prime is 189172799. The reversal of 189172768 is 867271981.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34888 + ... + 39943.

It is an arithmetic number, because the mean of its divisors is an integer number (15714720).

Almost surely, 2^189172768 is an apocalyptic number.

It is an amenable number.

189172768 is a deficient number, since it is larger than the sum of its proper divisors (187980512).

189172768 is an equidigital number, since it uses as much as digits as its factorization.

189172768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74920 (or 74912 counting only the distinct ones).

The product of its digits is 338688, while the sum is 49.

The square root of 189172768 is about 13754.0091609683. The cubic root of 189172768 is about 574.0541657537.

The spelling of 189172768 in words is "one hundred eighty-nine million, one hundred seventy-two thousand, seven hundred sixty-eight".