82789815 has 8 divisors (see below), whose sum is σ = 132463728. Its totient is φ = 44154560.

The previous prime is 82789807. The next prime is 82789829. The reversal of 82789815 is 51898728.

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

It is not a de Polignac number, because 82789815 - 2³ = 82789807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2759646 + ... + 2759675.

It is an arithmetic number, because the mean of its divisors is an integer number (16557966).

Almost surely, 2^82789815 is an apocalyptic number.

82789815 is a deficient number, since it is larger than the sum of its proper divisors (49673913).

82789815 is a wasteful number, since it uses less digits than its factorization.

82789815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5519329.

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

The square root of 82789815 is about 9098.8908664738. The cubic root of 82789815 is about 435.8385463278.

The spelling of 82789815 in words is "eighty-two million, seven hundred eighty-nine thousand, eight hundred fifteen".