79889649 has 24 divisors (see below), whose sum is σ = 129303360. Its totient is φ = 43664544.

The previous prime is 79889639. The next prime is 79889651. The reversal of 79889649 is 94698897.

It is not a de Polignac number, because 79889649 - 2⁵ = 79889617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79889592 and 79889601.

It is not an unprimeable number, because it can be changed into a prime (79889609) 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 in 23 ways as a sum of consecutive naturals, for example, 8434 + ... + 15195.

It is an arithmetic number, because the mean of its divisors is an integer number (5387640).

Almost surely, 2^79889649 is an apocalyptic number.

It is an amenable number.

79889649 is a deficient number, since it is larger than the sum of its proper divisors (49413711).

79889649 is a wasteful number, since it uses less digits than its factorization.

79889649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23669 (or 23662 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 60.

The square root of 79889649 is about 8938.1009728018. The cubic root of 79889649 is about 430.6887268230.

The spelling of 79889649 in words is "seventy-nine million, eight hundred eighty-nine thousand, six hundred forty-nine".