191279664 has 40 divisors (see below), whose sum is σ = 549044720. Its totient is φ = 63759744.

The previous prime is 191279663. The next prime is 191279701. The reversal of 191279664 is 466972191.

It is not an unprimeable number, because it can be changed into a prime (191279663) 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 7 ways as a sum of consecutive naturals, for example, 220957 + ... + 221820.

It is an arithmetic number, because the mean of its divisors is an integer number (13726118).

Almost surely, 2^191279664 is an apocalyptic number.

It is an amenable number.

191279664 is an abundant number, since it is smaller than the sum of its proper divisors (357765056).

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

191279664 is a wasteful number, since it uses less digits than its factorization.

191279664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442794 (or 442782 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 191279664 is about 13830.3891485381. The cubic root of 191279664 is about 576.1774626801.

The spelling of 191279664 in words is "one hundred ninety-one million, two hundred seventy-nine thousand, six hundred sixty-four".