781336368 has 110 divisors (see below), whose sum is σ = 2273491764. Its totient is φ = 260130528.

The previous prime is 781336349. The next prime is 781336403. The reversal of 781336368 is 863633187.

781336368 is a `hidden beast` number, since 7 + 8 + 1 + 3 + 3 + 636 + 8 = 666.

781336368 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×781336368² = 1220973039918862848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 21 ways as a sum of consecutive naturals, for example, 944371 + ... + 945197.

Almost surely, 2^781336368 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 781336368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136745882).

781336368 is an abundant number, since it is smaller than the sum of its proper divisors (1492155396).

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

781336368 is an frugal number, since it uses more digits than its factorization.

781336368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865 (or 832 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 781336368 is about 27952.3946738021. The cubic root of 781336368 is about 921.0418128690.

The spelling of 781336368 in words is "seven hundred eighty-one million, three hundred thirty-six thousand, three hundred sixty-eight".