79789321 has 4 divisors (see below), whose sum is σ = 81735444. Its totient is φ = 77843200.

The previous prime is 79789309. The next prime is 79789331. The reversal of 79789321 is 12398797.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38688400 + 41100921 = 6220^2 + 6411^2 .

It is a cyclic number.

It is not a de Polignac number, because 79789321 - 2¹⁵ = 79756553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79789331) 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, 973000 + ... + 973081.

It is an arithmetic number, because the mean of its divisors is an integer number (20433861).

Almost surely, 2^79789321 is an apocalyptic number.

It is an amenable number.

79789321 is a deficient number, since it is larger than the sum of its proper divisors (1946123).

79789321 is a wasteful number, since it uses less digits than its factorization.

79789321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946122.

The product of its digits is 190512, while the sum is 46.

The square root of 79789321 is about 8932.4868317843. The cubic root of 79789321 is about 430.5083603634.

The spelling of 79789321 in words is "seventy-nine million, seven hundred eighty-nine thousand, three hundred twenty-one".