191688980 has 48 divisors (see below), whose sum is σ = 469459200. Its totient is φ = 65719584.

The previous prime is 191688979. The next prime is 191689007. The reversal of 191688980 is 89886191.

It is a happy number.

191688980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7112 + ... + 20831.

It is an arithmetic number, because the mean of its divisors is an integer number (9780400).

Almost surely, 2^191688980 is an apocalyptic number.

191688980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191688980 is an abundant number, since it is smaller than the sum of its proper divisors (277770220).

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

191688980 is a wasteful number, since it uses less digits than its factorization.

191688980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27973 (or 27957 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 50.

The square root of 191688980 is about 13845.1789443113. The cubic root of 191688980 is about 576.5881538931.

The spelling of 191688980 in words is "one hundred ninety-one million, six hundred eighty-eight thousand, nine hundred eighty".