82217745 has 24 divisors (see below), whose sum is σ = 143073216. Its totient is φ = 43676448.

The previous prime is 82217741. The next prime is 82217747. The reversal of 82217745 is 54771228.

It is not a de Polignac number, because 82217745 - 2² = 82217741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82217741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8362 + ... + 15308.

It is an arithmetic number, because the mean of its divisors is an integer number (5961384).

Almost surely, 2^82217745 is an apocalyptic number.

It is an amenable number.

82217745 is a deficient number, since it is larger than the sum of its proper divisors (60855471).

82217745 is a wasteful number, since it uses less digits than its factorization.

82217745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7221 (or 7218 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 82217745 is about 9067.4001235194. The cubic root of 82217745 is about 434.8323571213.

The spelling of 82217745 in words is "eighty-two million, two hundred seventeen thousand, seven hundred forty-five".