79868513 has 4 divisors (see below), whose sum is σ = 80575428. Its totient is φ = 79161600.

The previous prime is 79868491. The next prime is 79868527. The reversal of 79868513 is 31586897.

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 9778129 + 70090384 = 3127^2 + 8372^2 .

It is a cyclic number.

It is not a de Polignac number, because 79868513 - 2⁶ = 79868449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79862513) 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 3 ways as a sum of consecutive naturals, for example, 353288 + ... + 353513.

It is an arithmetic number, because the mean of its divisors is an integer number (20143857).

Almost surely, 2^79868513 is an apocalyptic number.

It is an amenable number.

79868513 is a deficient number, since it is larger than the sum of its proper divisors (706915).

79868513 is a wasteful number, since it uses less digits than its factorization.

79868513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706914.

The product of its digits is 362880, while the sum is 47.

The square root of 79868513 is about 8936.9185405261. The cubic root of 79868513 is about 430.6507417609.

The spelling of 79868513 in words is "seventy-nine million, eight hundred sixty-eight thousand, five hundred thirteen".