776128631 has 2 divisors, whose sum is σ = 776128632. Its totient is φ = 776128630.

The previous prime is 776128621. The next prime is 776128651. The reversal of 776128631 is 136821677.

776128631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 776128631 - 2⁶ = 776128567 is a prime.

It is a super-2 number, since 2×776128631² = 1204751303715868322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (776128621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388064315 + 388064316.

It is an arithmetic number, because the mean of its divisors is an integer number (388064316).

Almost surely, 2^776128631 is an apocalyptic number.

776128631 is a deficient number, since it is larger than the sum of its proper divisors (1).

776128631 is an equidigital number, since it uses as much as digits as its factorization.

776128631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 776128631 is about 27859.0852505964. The cubic root of 776128631 is about 918.9909506336.

The spelling of 776128631 in words is "seven hundred seventy-six million, one hundred twenty-eight thousand, six hundred thirty-one".