79645779 has 6 divisors (see below), whose sum is σ = 115043916. Its totient is φ = 53097180.

The previous prime is 79645763. The next prime is 79645801. The reversal of 79645779 is 97754697.

It is a happy number.

79645779 is a `hidden beast` number, since 7 + 9 + 64 + 577 + 9 = 666.

It is not a de Polignac number, because 79645779 - 2⁴ = 79645763 is a prime.

It is a super-2 number, since 2×79645779² = 12686900225033682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79645759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4424757 + ... + 4424774.

It is an arithmetic number, because the mean of its divisors is an integer number (19173986).

Almost surely, 2^79645779 is an apocalyptic number.

79645779 is a deficient number, since it is larger than the sum of its proper divisors (35398137).

79645779 is a wasteful number, since it uses less digits than its factorization.

79645779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8849537 (or 8849534 counting only the distinct ones).

The product of its digits is 3333960, while the sum is 54.

The square root of 79645779 is about 8924.4483863150. The cubic root of 79645779 is about 430.2500420628.

The spelling of 79645779 in words is "seventy-nine million, six hundred forty-five thousand, seven hundred seventy-nine".