191968728 has 128 divisors (see below), whose sum is σ = 571276800. Its totient is φ = 52614144.

The previous prime is 191968717. The next prime is 191968739. The reversal of 191968728 is 827869191.

It is an interprime number because it is at equal distance from previous prime (191968717) and next prime (191968739).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 553051 + ... + 553397.

It is an arithmetic number, because the mean of its divisors is an integer number (4463100).

Almost surely, 2^191968728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191968728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285638400).

191968728 is an abundant number, since it is smaller than the sum of its proper divisors (379308072).

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

191968728 is a wasteful number, since it uses less digits than its factorization.

191968728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 485 counting only the distinct ones).

The product of its digits is 435456, while the sum is 51.

The square root of 191968728 is about 13855.2779834978. The cubic root of 191968728 is about 576.8685055692.

The spelling of 191968728 in words is "one hundred ninety-one million, nine hundred sixty-eight thousand, seven hundred twenty-eight".