191896660 has 24 divisors (see below), whose sum is σ = 406064736. Its totient is φ = 76171680.

The previous prime is 191896577. The next prime is 191896673. The reversal of 191896660 is 66698191.

It is a self number, because there is not a number n which added to its sum of digits gives 191896660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34002 + ... + 39241.

It is an arithmetic number, because the mean of its divisors is an integer number (16919364).

Almost surely, 2^191896660 is an apocalyptic number.

191896660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191896660 is an abundant number, since it is smaller than the sum of its proper divisors (214168076).

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

191896660 is a wasteful number, since it uses less digits than its factorization.

191896660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73383 (or 73381 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 191896660 is about 13852.6769976059. The cubic root of 191896660 is about 576.7963081103.

The spelling of 191896660 in words is "one hundred ninety-one million, eight hundred ninety-six thousand, six hundred sixty".