82321387 has 4 divisors (see below), whose sum is σ = 82360800. Its totient is φ = 82281976.

The previous prime is 82321373. The next prime is 82321409. The reversal of 82321387 is 78312328.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82321387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82321787) 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, 16387 + ... + 20812.

It is an arithmetic number, because the mean of its divisors is an integer number (20590200).

Almost surely, 2^82321387 is an apocalyptic number.

82321387 is a deficient number, since it is larger than the sum of its proper divisors (39413).

82321387 is a wasteful number, since it uses less digits than its factorization.

82321387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39412.

The product of its digits is 16128, while the sum is 34.

The square root of 82321387 is about 9073.1134127156. The cubic root of 82321387 is about 435.0149939783.

The spelling of 82321387 in words is "eighty-two million, three hundred twenty-one thousand, three hundred eighty-seven".