82788218 has 4 divisors (see below), whose sum is σ = 124182330. Its totient is φ = 41394108.

The previous prime is 82788217. The next prime is 82788229. The reversal of 82788218 is 81288728.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75568249 + 7219969 = 8693^2 + 2687^2 .

It is not an unprimeable number, because it can be changed into a prime (82788217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20697053 + ... + 20697056.

Almost surely, 2^82788218 is an apocalyptic number.

82788218 is a deficient number, since it is larger than the sum of its proper divisors (41394112).

82788218 is a wasteful number, since it uses less digits than its factorization.

82788218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41394111.

The product of its digits is 114688, while the sum is 44.

The square root of 82788218 is about 9098.8031081016. The cubic root of 82788218 is about 435.8357438952.

The spelling of 82788218 in words is "eighty-two million, seven hundred eighty-eight thousand, two hundred eighteen".