79776761 has 2 divisors, whose sum is σ = 79776762. Its totient is φ = 79776760.

The previous prime is 79776737. The next prime is 79776799. The reversal of 79776761 is 16767797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69822736 + 9954025 = 8356^2 + 3155^2 .

It is a cyclic number.

It is not a de Polignac number, because 79776761 - 2¹⁴ = 79760377 is a prime.

It is a super-2 number, since 2×79776761² = 12728663191302242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79776731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39888380 + 39888381.

It is an arithmetic number, because the mean of its divisors is an integer number (39888381).

Almost surely, 2^79776761 is an apocalyptic number.

It is an amenable number.

79776761 is a deficient number, since it is larger than the sum of its proper divisors (1).

79776761 is an equidigital number, since it uses as much as digits as its factorization.

79776761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777924, while the sum is 50.

The square root of 79776761 is about 8931.7837524203. The cubic root of 79776761 is about 430.4857697515.

The spelling of 79776761 in words is "seventy-nine million, seven hundred seventy-six thousand, seven hundred sixty-one".