79828581 has 8 divisors (see below), whose sum is σ = 121643584. Its totient is φ = 45616320.

The previous prime is 79828571. The next prime is 79828589. The reversal of 79828581 is 18582897.

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

It is not a de Polignac number, because 79828581 - 2⁷ = 79828453 is a prime.

It is a super-2 number, since 2×79828581² = 12745204688947122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79828581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79828589) 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, 1900660 + ... + 1900701.

It is an arithmetic number, because the mean of its divisors is an integer number (15205448).

Almost surely, 2^79828581 is an apocalyptic number.

It is an amenable number.

79828581 is a deficient number, since it is larger than the sum of its proper divisors (41815003).

79828581 is a wasteful number, since it uses less digits than its factorization.

79828581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801371.

The product of its digits is 322560, while the sum is 48.

The square root of 79828581 is about 8934.6841578200. The cubic root of 79828581 is about 430.5789587285.

The spelling of 79828581 in words is "seventy-nine million, eight hundred twenty-eight thousand, five hundred eighty-one".