781135680 has 112 divisors (see below), whose sum is σ = 2670925824. Its totient is φ = 192276480.

The previous prime is 781135679. The next prime is 781135709. The reversal of 781135680 is 86531187.

781135680 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 2×781135680² = 1220345901138124800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18816 + ... + 43775.

It is an arithmetic number, because the mean of its divisors is an integer number (23847552).

Almost surely, 2^781135680 is an apocalyptic number.

It is an amenable number.

781135680 is an abundant number, since it is smaller than the sum of its proper divisors (1889790144).

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

781135680 is a wasteful number, since it uses less digits than its factorization.

781135680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62624 (or 62614 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 781135680 is about 27948.8046256007. The cubic root of 781135680 is about 920.9629488974.

The spelling of 781135680 in words is "seven hundred eighty-one million, one hundred thirty-five thousand, six hundred eighty".