8799779979 has 20 divisors (see below), whose sum is σ = 13150800784. Its totient is φ = 5864087664.

The previous prime is 8799779977. The next prime is 8799779993. The reversal of 8799779979 is 9799779978.

It is a happy number.

It is not a de Polignac number, because 8799779979 - 2¹ = 8799779977 is a prime.

It is a super-2 number, since 2×8799779979² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8799779898 and 8799779907.

It is not an unprimeable number, because it can be changed into a prime (8799779977) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 185874 + ... + 228360.

Almost surely, 2^8799779979 is an apocalyptic number.

8799779979 is a deficient number, since it is larger than the sum of its proper divisors (4351020805).

8799779979 is a wasteful number, since it uses less digits than its factorization.

8799779979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45056 (or 45047 counting only the distinct ones).

The product of its digits is 1134213192, while the sum is 81.

The square root of 8799779979 is about 93807.1424732680. The cubic root of 8799779979 is about 2064.5430244585.

Subtracting 8799779979 from its reverse (9799779978), we obtain a palindrome (999999999).

The spelling of 8799779979 in words is "eight billion, seven hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred seventy-nine".