191307028 has 24 divisors (see below), whose sum is σ = 371417760. Its totient is φ = 85482720.

The previous prime is 191307023. The next prime is 191307037. The reversal of 191307028 is 820703191.

191307028 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 not an unprimeable number, because it can be changed into a prime (191307023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34251 + ... + 39442.

It is an arithmetic number, because the mean of its divisors is an integer number (15475740).

Almost surely, 2^191307028 is an apocalyptic number.

It is an amenable number.

191307028 is a deficient number, since it is larger than the sum of its proper divisors (180110732).

191307028 is a wasteful number, since it uses less digits than its factorization.

191307028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73767 (or 73765 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 191307028 is about 13831.3783839500. The cubic root of 191307028 is about 576.2049368820.

The spelling of 191307028 in words is "one hundred ninety-one million, three hundred seven thousand, twenty-eight".