775857681 has 6 divisors (see below), whose sum is σ = 1120683330. Its totient is φ = 517238448.

The previous prime is 775857673. The next prime is 775857707. The reversal of 775857681 is 186758577.

It is a happy number.

775857681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 434347281 + 341510400 = 20841^2 + 18480^2 .

It is not a de Polignac number, because 775857681 - 2³ = 775857673 is a prime.

It is a super-2 number, since 2×775857681² = 1203910282333395522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (775857631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43103196 + ... + 43103213.

It is an arithmetic number, because the mean of its divisors is an integer number (186780555).

Almost surely, 2^775857681 is an apocalyptic number.

It is an amenable number.

775857681 is a deficient number, since it is larger than the sum of its proper divisors (344825649).

775857681 is a wasteful number, since it uses less digits than its factorization.

775857681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86206415 (or 86206412 counting only the distinct ones).

The product of its digits is 3292800, while the sum is 54.

The square root of 775857681 is about 27854.2219600548. The cubic root of 775857681 is about 918.8839968936.

The spelling of 775857681 in words is "seven hundred seventy-five million, eight hundred fifty-seven thousand, six hundred eighty-one".