79807745 has 4 divisors (see below), whose sum is σ = 95769300. Its totient is φ = 63846192.

The previous prime is 79807711. The next prime is 79807747. The reversal of 79807745 is 54770897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54770897 = 1451 ⋅37747.

It can be written as a sum of positive squares in 2 ways, for example, as 40857664 + 38950081 = 6392^2 + 6241^2 .

It is a cyclic number.

It is not a de Polignac number, because 79807745 - 2¹² = 79803649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79807745.

It is not an unprimeable number, because it can be changed into a prime (79807747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7980770 + ... + 7980779.

It is an arithmetic number, because the mean of its divisors is an integer number (23942325).

Almost surely, 2^79807745 is an apocalyptic number.

It is an amenable number.

79807745 is a deficient number, since it is larger than the sum of its proper divisors (15961555).

79807745 is a wasteful number, since it uses less digits than its factorization.

79807745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15961554.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 79807745 is about 8933.5180640104. The cubic root of 79807745 is about 430.5414937682.

The spelling of 79807745 in words is "seventy-nine million, eight hundred seven thousand, seven hundred forty-five".