82227781 has 4 divisors (see below), whose sum is σ = 82285600. Its totient is φ = 82169964.

The previous prime is 82227749. The next prime is 82227809. The reversal of 82227781 is 18772228.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82227781 - 2⁵ = 82227749 is a prime.

It is a super-2 number, since 2×82227781² = 13522815936367922, 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 82227781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82227721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26721 + ... + 29638.

It is an arithmetic number, because the mean of its divisors is an integer number (20571400).

Almost surely, 2^82227781 is an apocalyptic number.

It is an amenable number.

82227781 is a deficient number, since it is larger than the sum of its proper divisors (57819).

82227781 is a wasteful number, since it uses less digits than its factorization.

82227781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57818.

The product of its digits is 25088, while the sum is 37.

The square root of 82227781 is about 9067.9535177459. The cubic root of 82227781 is about 434.8500491657.

The spelling of 82227781 in words is "eighty-two million, two hundred twenty-seven thousand, seven hundred eighty-one".