79772866 has 4 divisors (see below), whose sum is σ = 119659302. Its totient is φ = 39886432.

The previous prime is 79772863. The next prime is 79772873. The reversal of 79772866 is 66827797.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 69372241 + 10400625 = 8329^2 + 3225^2 .

It is not an unprimeable number, because it can be changed into a prime (79772863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19943215 + ... + 19943218.

Almost surely, 2^79772866 is an apocalyptic number.

79772866 is a deficient number, since it is larger than the sum of its proper divisors (39886436).

79772866 is a wasteful number, since it uses less digits than its factorization.

79772866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39886435.

The product of its digits is 1778112, while the sum is 52.

The square root of 79772866 is about 8931.5657082059. The cubic root of 79772866 is about 430.4787636621.

The spelling of 79772866 in words is "seventy-nine million, seven hundred seventy-two thousand, eight hundred sixty-six".