82263821 has 4 divisors (see below), whose sum is σ = 82459644. Its totient is φ = 82068000.

The previous prime is 82263817. The next prime is 82263823. The reversal of 82263821 is 12836228.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21252100 + 61011721 = 4610^2 + 7811^2 .

It is a cyclic number.

It is not a de Polignac number, because 82263821 - 2² = 82263817 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 (82263823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97280 + ... + 98121.

It is an arithmetic number, because the mean of its divisors is an integer number (20614911).

Almost surely, 2^82263821 is an apocalyptic number.

It is an amenable number.

82263821 is a deficient number, since it is larger than the sum of its proper divisors (195823).

82263821 is a wasteful number, since it uses less digits than its factorization.

82263821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195822.

The product of its digits is 9216, while the sum is 32.

The square root of 82263821 is about 9069.9405179968. The cubic root of 82263821 is about 434.9135707091.

The spelling of 82263821 in words is "eighty-two million, two hundred sixty-three thousand, eight hundred twenty-one".