82778799 has 8 divisors (see below), whose sum is σ = 110600320. Its totient is φ = 55071576.

The previous prime is 82778791. The next prime is 82778837. The reversal of 82778799 is 99787728.

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

It is not a de Polignac number, because 82778799 - 2³ = 82778791 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 (82778791) by changing a digit.

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, 26869 + ... + 29790.

It is an arithmetic number, because the mean of its divisors is an integer number (13825040).

Almost surely, 2^82778799 is an apocalyptic number.

82778799 is a deficient number, since it is larger than the sum of its proper divisors (27821521).

82778799 is a wasteful number, since it uses less digits than its factorization.

82778799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57149.

The product of its digits is 3556224, while the sum is 57.

The square root of 82778799 is about 9098.2854978287. The cubic root of 82778799 is about 435.8192146005.

The spelling of 82778799 in words is "eighty-two million, seven hundred seventy-eight thousand, seven hundred ninety-nine".