79828213 has 4 divisors (see below), whose sum is σ = 82580940. Its totient is φ = 77075488.

The previous prime is 79828207. The next prime is 79828219. The reversal of 79828213 is 31282897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31282897 = 991 ⋅31567.

It is an interprime number because it is at equal distance from previous prime (79828207) and next prime (79828219).

It can be written as a sum of positive squares in 2 ways, for example, as 62837329 + 16990884 = 7927^2 + 4122^2 .

It is a cyclic number.

It is not a de Polignac number, because 79828213 - 2⁵ = 79828181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79828219) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1376320 + ... + 1376377.

It is an arithmetic number, because the mean of its divisors is an integer number (20645235).

Almost surely, 2^79828213 is an apocalyptic number.

It is an amenable number.

79828213 is a deficient number, since it is larger than the sum of its proper divisors (2752727).

79828213 is a wasteful number, since it uses less digits than its factorization.

79828213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752726.

The product of its digits is 48384, while the sum is 40.

The square root of 79828213 is about 8934.6635638954. The cubic root of 79828213 is about 430.5782970887.

The spelling of 79828213 in words is "seventy-nine million, eight hundred twenty-eight thousand, two hundred thirteen".