79642289 has 4 divisors (see below), whose sum is σ = 80131056. Its totient is φ = 79153524.

The previous prime is 79642279. The next prime is 79642301. The reversal of 79642289 is 98224697.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98224697 = 23 ⋅4270639.

It is a cyclic number.

It is not a de Polignac number, because 79642289 - 2¹⁶ = 79576753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79642219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244139 + ... + 244464.

It is an arithmetic number, because the mean of its divisors is an integer number (20032764).

Almost surely, 2^79642289 is an apocalyptic number.

It is an amenable number.

79642289 is a deficient number, since it is larger than the sum of its proper divisors (488767).

79642289 is a wasteful number, since it uses less digits than its factorization.

79642289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488766.

The product of its digits is 435456, while the sum is 47.

The square root of 79642289 is about 8924.2528538808. The cubic root of 79642289 is about 430.2437575926.

The spelling of 79642289 in words is "seventy-nine million, six hundred forty-two thousand, two hundred eighty-nine".