191489664 has 64 divisors (see below), whose sum is σ = 520518240. Its totient is φ = 62340096.

The previous prime is 191489647. The next prime is 191489677. The reversal of 191489664 is 466984191.

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

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10714 + ... + 22310.

Almost surely, 2^191489664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191489664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260259120).

191489664 is an abundant number, since it is smaller than the sum of its proper divisors (329028576).

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

191489664 is a wasteful number, since it uses less digits than its factorization.

191489664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11657 (or 11645 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 191489664 is about 13837.9790431985. The cubic root of 191489664 is about 576.3882413413.

The spelling of 191489664 in words is "one hundred ninety-one million, four hundred eighty-nine thousand, six hundred sixty-four".