781322872 has 64 divisors (see below), whose sum is σ = 1662249600. Its totient is φ = 341040000.

The previous prime is 781322851. The next prime is 781322887. The reversal of 781322872 is 278223187.

It is a super-2 number, since 2×781322872² = 1220930860620656768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 537747 + ... + 539197.

It is an arithmetic number, because the mean of its divisors is an integer number (25972650).

Almost surely, 2^781322872 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 781322872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831124800).

781322872 is an abundant number, since it is smaller than the sum of its proper divisors (880926728).

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

781322872 is a wasteful number, since it uses less digits than its factorization.

781322872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708 (or 1704 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 781322872 is about 27952.1532623159. The cubic root of 781322872 is about 921.0365097957.

The spelling of 781322872 in words is "seven hundred eighty-one million, three hundred twenty-two thousand, eight hundred seventy-two".