82321540 has 24 divisors (see below), whose sum is σ = 197572032. Its totient is φ = 28224480.

The previous prime is 82321511. The next prime is 82321543. The reversal of 82321540 is 4512328.

It is not an unprimeable number, because it can be changed into a prime (82321543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293866 + ... + 294145.

It is an arithmetic number, because the mean of its divisors is an integer number (8232168).

Almost surely, 2^82321540 is an apocalyptic number.

It is an amenable number.

82321540 is an abundant number, since it is smaller than the sum of its proper divisors (115250492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82321540 is a wasteful number, since it uses less digits than its factorization.

82321540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588027 (or 588025 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 82321540 is about 9073.1218442166. The cubic root of 82321540 is about 435.0152634799.

Adding to 82321540 its reverse (4512328), we get a palindrome (86833868).

The spelling of 82321540 in words is "eighty-two million, three hundred twenty-one thousand, five hundred forty".