776128636 has 6 divisors (see below), whose sum is σ = 1358225120. Its totient is φ = 388064316.

The previous prime is 776128631. The next prime is 776128651. The reversal of 776128636 is 636821677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (776128631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97016076 + ... + 97016083.

Almost surely, 2^776128636 is an apocalyptic number.

It is an amenable number.

776128636 is a deficient number, since it is larger than the sum of its proper divisors (582096484).

776128636 is a wasteful number, since it uses less digits than its factorization.

776128636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194032163 (or 194032161 counting only the distinct ones).

The product of its digits is 508032, while the sum is 46.

The square root of 776128636 is about 27859.0853403338. The cubic root of 776128636 is about 918.9909526071.

The spelling of 776128636 in words is "seven hundred seventy-six million, one hundred twenty-eight thousand, six hundred thirty-six".