79637689 has 8 divisors (see below), whose sum is σ = 80970120. Its totient is φ = 78316416.

The previous prime is 79637681. The next prime is 79637699. The reversal of 79637689 is 98673697.

It can be written as a sum of positive squares in 4 ways, for example, as 49112064 + 30525625 = 7008^2 + 5525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79637689 - 2³ = 79637681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79637681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12267 + ... + 17599.

It is an arithmetic number, because the mean of its divisors is an integer number (10121265).

Almost surely, 2^79637689 is an apocalyptic number.

It is an amenable number.

79637689 is a deficient number, since it is larger than the sum of its proper divisors (1332431).

79637689 is a wasteful number, since it uses less digits than its factorization.

79637689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5579.

The product of its digits is 3429216, while the sum is 55.

The square root of 79637689 is about 8923.9951255029. The cubic root of 79637689 is about 430.2354740562.

The spelling of 79637689 in words is "seventy-nine million, six hundred thirty-seven thousand, six hundred eighty-nine".