191728850 has 12 divisors (see below), whose sum is σ = 356615754. Its totient is φ = 76691520.

The previous prime is 191728811. The next prime is 191728853. The reversal of 191728850 is 58827191.

It can be written as a sum of positive squares in 3 ways, for example, as 161467849 + 30261001 = 12707^2 + 5501^2 .

It is a junction number, because it is equal to n+sod(n) for n = 191728798 and 191728807.

It is not an unprimeable number, because it can be changed into a prime (191728853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1917239 + ... + 1917338.

Almost surely, 2^191728850 is an apocalyptic number.

191728850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191728850 is a deficient number, since it is larger than the sum of its proper divisors (164886904).

191728850 is a wasteful number, since it uses less digits than its factorization.

191728850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834589 (or 3834584 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 191728850 is about 13846.6187208286. The cubic root of 191728850 is about 576.6281265893.

The spelling of 191728850 in words is "one hundred ninety-one million, seven hundred twenty-eight thousand, eight hundred fifty".