82778792 has 32 divisors (see below), whose sum is σ = 159787080. Its totient is φ = 40185600.

The previous prime is 82778791. The next prime is 82778837. The reversal of 82778792 is 29787728.

It can be written as a sum of positive squares in 4 ways, for example, as 81830116 + 948676 = 9046^2 + 974^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 82778792.

It is not an unprimeable number, because it can be changed into a prime (82778791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41858 + ... + 43790.

Almost surely, 2^82778792 is an apocalyptic number.

It is an amenable number.

82778792 is a deficient number, since it is larger than the sum of its proper divisors (77008288).

82778792 is a wasteful number, since it uses less digits than its factorization.

82778792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093 (or 2089 counting only the distinct ones).

The product of its digits is 790272, while the sum is 50.

The square root of 82778792 is about 9098.2851131408. The cubic root of 82778792 is about 435.8192023158.

The spelling of 82778792 in words is "eighty-two million, seven hundred seventy-eight thousand, seven hundred ninety-two".