189491000064 has 288 divisors, whose sum is σ = 534639268800. Its totient is φ = 59488665600.

The previous prime is 189490999961. The next prime is 189491000087. The reversal of 189491000064 is 460000194981.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 270314914 + ... + 270315614.

It is an arithmetic number, because the mean of its divisors is an integer number (1856386350).

Almost surely, 2^189491000064 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 189491000064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267319634400).

189491000064 is an abundant number, since it is smaller than the sum of its proper divisors (345148268736).

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

189491000064 is a wasteful number, since it uses less digits than its factorization.

189491000064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 189491000064 in words is "one hundred eighty-nine billion, four hundred ninety-one million, sixty-four", and thus it is an aban number.