191420064 has 144 divisors (see below), whose sum is σ = 614013120. Its totient is φ = 57974400.

The previous prime is 191420063. The next prime is 191420069. The reversal of 191420064 is 460024191.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (191420063) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 103629 + ... + 105459.

It is an arithmetic number, because the mean of its divisors is an integer number (4263980).

Almost surely, 2^191420064 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 191420064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307006560).

191420064 is an abundant number, since it is smaller than the sum of its proper divisors (422593056).

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

191420064 is a wasteful number, since it uses less digits than its factorization.

191420064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872 (or 1847 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 191420064 is about 13835.4639965561. The cubic root of 191420064 is about 576.3184003516.

The spelling of 191420064 in words is "one hundred ninety-one million, four hundred twenty thousand, sixty-four".