79447779 has 12 divisors (see below), whose sum is σ = 114843456. Its totient is φ = 52925712.

The previous prime is 79447757. The next prime is 79447799. The reversal of 79447779 is 97774497.

It is not a de Polignac number, because 79447779 - 2¹¹ = 79445731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79447799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14542 + ... + 19244.

It is an arithmetic number, because the mean of its divisors is an integer number (9570288).

Almost surely, 2^79447779 is an apocalyptic number.

79447779 is a deficient number, since it is larger than the sum of its proper divisors (35395677).

79447779 is a wasteful number, since it uses less digits than its factorization.

79447779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6586 (or 6583 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 54.

The square root of 79447779 is about 8913.3483607452. The cubic root of 79447779 is about 429.8932112678.

The spelling of 79447779 in words is "seventy-nine million, four hundred forty-seven thousand, seven hundred seventy-nine".