776807138 has 8 divisors (see below), whose sum is σ = 1165334700. Its totient is φ = 388362240.

The previous prime is 776807131. The next prime is 776807173. The reversal of 776807138 is 831708677.

It can be written as a sum of positive squares in 2 ways, for example, as 610732369 + 166074769 = 24713^2 + 12887^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 776807092 and 776807101.

It is not an unprimeable number, because it can be changed into a prime (776807131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15458 + ... + 42338.

Almost surely, 2^776807138 is an apocalyptic number.

776807138 is a deficient number, since it is larger than the sum of its proper divisors (388527562).

776807138 is a wasteful number, since it uses less digits than its factorization.

776807138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41332.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 776807138 is about 27871.2600719810. The cubic root of 776807138 is about 919.2586726546.

The spelling of 776807138 in words is "seven hundred seventy-six million, eight hundred seven thousand, one hundred thirty-eight".