191970864 has 80 divisors (see below), whose sum is σ = 557330400. Its totient is φ = 63258624.

The previous prime is 191970847. The next prime is 191970871. The reversal of 191970864 is 468079191.

It is a happy number.

191970864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35952 + ... + 40944.

It is an arithmetic number, because the mean of its divisors is an integer number (6966630).

Almost surely, 2^191970864 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 191970864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278665200).

191970864 is an abundant number, since it is smaller than the sum of its proper divisors (365359536).

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

191970864 is a wasteful number, since it uses less digits than its factorization.

191970864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5099 (or 5087 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 191970864 is about 13855.3550658220. The cubic root of 191970864 is about 576.8706451304.

The spelling of 191970864 in words is "one hundred ninety-one million, nine hundred seventy thousand, eight hundred sixty-four".