79968421 has 8 divisors (see below), whose sum is σ = 86670584. Its totient is φ = 73344960.

The previous prime is 79968389. The next prime is 79968431. The reversal of 79968421 is 12486997.

It can be written as a sum of positive squares in 4 ways, for example, as 7480225 + 72488196 = 2735^2 + 8514^2 .

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

It is not a de Polignac number, because 79968421 - 2⁵ = 79968389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79968431) 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 7 ways as a sum of consecutive naturals, for example, 17550 + ... + 21631.

It is an arithmetic number, because the mean of its divisors is an integer number (10833823).

Almost surely, 2^79968421 is an apocalyptic number.

It is an amenable number.

79968421 is a deficient number, since it is larger than the sum of its proper divisors (6702163).

79968421 is a wasteful number, since it uses less digits than its factorization.

79968421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39351.

The product of its digits is 217728, while the sum is 46.

The square root of 79968421 is about 8942.5064159888. The cubic root of 79968421 is about 430.8302348005.

The spelling of 79968421 in words is "seventy-nine million, nine hundred sixty-eight thousand, four hundred twenty-one".