189194380464 has 80 divisors (see below), whose sum is σ = 496947121920. Its totient is φ = 62012079360.

The previous prime is 189194380457. The next prime is 189194380469. The reversal of 189194380464 is 464083491981.

It is not an unprimeable number, because it can be changed into a prime (189194380469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1218394 + ... + 1364870.

It is an arithmetic number, because the mean of its divisors is an integer number (6211839024).

Almost surely, 2^189194380464 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 189194380464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248473560960).

189194380464 is an abundant number, since it is smaller than the sum of its proper divisors (307752741456).

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

189194380464 is a wasteful number, since it uses less digits than its factorization.

189194380464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146938 (or 146932 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 57.

The spelling of 189194380464 in words is "one hundred eighty-nine billion, one hundred ninety-four million, three hundred eighty thousand, four hundred sixty-four".