82326781 has 6 divisors (see below), whose sum is σ = 82942782. Its totient is φ = 81715320.

The previous prime is 82326779. The next prime is 82326799. The reversal of 82326781 is 18762328.

It can be written as a sum of positive squares in only one way, i.e., 81631225 + 695556 = 9035^2 + 834^2 .

It is not a de Polignac number, because 82326781 - 2¹ = 82326779 is a prime.

It is a super-2 number, since 2×82326781² = 13555397739643922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82326781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82326481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17191 + ... + 21451.

It is an arithmetic number, because the mean of its divisors is an integer number (13823797).

Almost surely, 2^82326781 is an apocalyptic number.

It is an amenable number.

82326781 is a deficient number, since it is larger than the sum of its proper divisors (616001).

82326781 is an equidigital number, since it uses as much as digits as its factorization.

82326781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539 (or 4400 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 82326781 is about 9073.4106597244. The cubic root of 82326781 is about 435.0244950314.

The spelling of 82326781 in words is "eighty-two million, three hundred twenty-six thousand, seven hundred eighty-one".