766716397 has 16 divisors (see below), whose sum is σ = 800077824. Its totient is φ = 733950000.

The previous prime is 766716389. The next prime is 766716427. The reversal of 766716397 is 793617667.

It is a cyclic number.

It is not a de Polignac number, because 766716397 - 2³ = 766716389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766776397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1641558 + ... + 1642024.

It is an arithmetic number, because the mean of its divisors is an integer number (50004864).

Almost surely, 2^766716397 is an apocalyptic number.

It is an amenable number.

766716397 is a deficient number, since it is larger than the sum of its proper divisors (33361427).

766716397 is a wasteful number, since it uses less digits than its factorization.

766716397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its digits is 2000376, while the sum is 52.

The square root of 766716397 is about 27689.6442194550. The cubic root of 766716397 is about 915.2609155687.

The spelling of 766716397 in words is "seven hundred sixty-six million, seven hundred sixteen thousand, three hundred ninety-seven".