191287064 has 16 divisors (see below), whose sum is σ = 363715920. Its totient is φ = 94296160.

The previous prime is 191287051. The next prime is 191287069. The reversal of 191287064 is 460782191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191287069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167819 + ... + 168954.

It is an arithmetic number, because the mean of its divisors is an integer number (22732245).

Almost surely, 2^191287064 is an apocalyptic number.

It is an amenable number.

191287064 is a deficient number, since it is larger than the sum of its proper divisors (172428856).

191287064 is a wasteful number, since it uses less digits than its factorization.

191287064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336850 (or 336846 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 191287064 is about 13830.6566727687. The cubic root of 191287064 is about 576.1848927403.

The spelling of 191287064 in words is "one hundred ninety-one million, two hundred eighty-seven thousand, sixty-four".