791065128 has 128 divisors (see below), whose sum is σ = 2382981120. Its totient is φ = 213945600.

The previous prime is 791065127. The next prime is 791065159. The reversal of 791065128 is 821560197.

It is not an unprimeable number, because it can be changed into a prime (791065127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389251 + ... + 391277.

It is an arithmetic number, because the mean of its divisors is an integer number (18617040).

Almost surely, 2^791065128 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 791065128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1191490560).

791065128 is an abundant number, since it is smaller than the sum of its proper divisors (1591915992).

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

791065128 is a wasteful number, since it uses less digits than its factorization.

791065128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167 (or 2163 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 791065128 is about 28125.8800395650. The cubic root of 791065128 is about 924.8488198995.

The spelling of 791065128 in words is "seven hundred ninety-one million, sixty-five thousand, one hundred twenty-eight".