776046721 has 4 divisors (see below), whose sum is σ = 786677572. Its totient is φ = 765415872.

The previous prime is 776046707. The next prime is 776046737. The reversal of 776046721 is 127640677.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 652036225 + 124010496 = 25535^2 + 11136^2 .

It is a cyclic number.

It is not a de Polignac number, because 776046721 - 2²³ = 767658113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (776046701) 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, 5315316 + ... + 5315461.

It is an arithmetic number, because the mean of its divisors is an integer number (196669393).

Almost surely, 2^776046721 is an apocalyptic number.

It is an amenable number.

776046721 is a deficient number, since it is larger than the sum of its proper divisors (10630851).

776046721 is a wasteful number, since it uses less digits than its factorization.

776046721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10630850.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 776046721 is about 27857.6151348244. The cubic root of 776046721 is about 918.9586204270.

The spelling of 776046721 in words is "seven hundred seventy-six million, forty-six thousand, seven hundred twenty-one".