191028738 has 16 divisors (see below), whose sum is σ = 382198176. Its totient is φ = 63652800.

The previous prime is 191028737. The next prime is 191028749. The reversal of 191028738 is 837820191.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 191028696 and 191028705.

It is not an unprimeable number, because it can be changed into a prime (191028737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21913 + ... + 29363.

It is an arithmetic number, because the mean of its divisors is an integer number (23887386).

Almost surely, 2^191028738 is an apocalyptic number.

191028738 is an abundant number, since it is smaller than the sum of its proper divisors (191169438).

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

191028738 is a wasteful number, since it uses less digits than its factorization.

191028738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11729.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 191028738 is about 13821.3146263299. The cubic root of 191028738 is about 575.9254038717.

The spelling of 191028738 in words is "one hundred ninety-one million, twenty-eight thousand, seven hundred thirty-eight".