781318056 has 32 divisors (see below), whose sum is σ = 1957541760. Its totient is φ = 259873152.

The previous prime is 781318049. The next prime is 781318081. The reversal of 781318056 is 650813187.

It is a super-2 number, since 2×781318056² = 1220915809263238272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24045 + ... + 46268.

It is an arithmetic number, because the mean of its divisors is an integer number (61173180).

Almost surely, 2^781318056 is an apocalyptic number.

It is an amenable number.

781318056 is an abundant number, since it is smaller than the sum of its proper divisors (1176223704).

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

781318056 is a wasteful number, since it uses less digits than its factorization.

781318056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70785 (or 70781 counting only the distinct ones).

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

The square root of 781318056 is about 27952.0671149738. The cubic root of 781318056 is about 921.0346173980.

The spelling of 781318056 in words is "seven hundred eighty-one million, three hundred eighteen thousand, fifty-six".