191878656 has 80 divisors (see below), whose sum is σ = 521042544. Its totient is φ = 62726144.

The previous prime is 191878639. The next prime is 191878691. The reversal of 191878656 is 656878191.

191878656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 191878599 and 191878608.

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, 80230 + ... + 82586.

Almost surely, 2^191878656 is an apocalyptic number.

191878656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191878656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260521272).

191878656 is an abundant number, since it is smaller than the sum of its proper divisors (329163888).

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

191878656 is an equidigital number, since it uses as much as digits as its factorization.

191878656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431 (or 2415 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 191878656 is about 13852.0271440681. The cubic root of 191878656 is about 576.7782689471.

The spelling of 191878656 in words is "one hundred ninety-one million, eight hundred seventy-eight thousand, six hundred fifty-six".