82307213 has 4 divisors (see below), whose sum is σ = 84314748. Its totient is φ = 80299680.

The previous prime is 82307209. The next prime is 82307233. The reversal of 82307213 is 31270328.

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 11377129 + 70930084 = 3373^2 + 8422^2 .

It is a cyclic number.

It is not a de Polignac number, because 82307213 - 2² = 82307209 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 (82307233) 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, 1003706 + ... + 1003787.

It is an arithmetic number, because the mean of its divisors is an integer number (21078687).

Almost surely, 2^82307213 is an apocalyptic number.

It is an amenable number.

82307213 is a deficient number, since it is larger than the sum of its proper divisors (2007535).

82307213 is a wasteful number, since it uses less digits than its factorization.

82307213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007534.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 82307213 is about 9072.3322800700. The cubic root of 82307213 is about 434.9900257545.

The spelling of 82307213 in words is "eighty-two million, three hundred seven thousand, two hundred thirteen".