82185540 has 24 divisors (see below), whose sum is σ = 230119680. Its totient is φ = 21916128.

The previous prime is 82185539. The next prime is 82185541. The reversal of 82185540 is 4558128.

It is an interprime number because it is at equal distance from previous prime (82185539) and next prime (82185541).

It is not an unprimeable number, because it can be changed into a prime (82185541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684820 + ... + 684939.

It is an arithmetic number, because the mean of its divisors is an integer number (9588320).

Almost surely, 2^82185540 is an apocalyptic number.

It is an amenable number.

82185540 is an abundant number, since it is smaller than the sum of its proper divisors (147934140).

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

82185540 is a wasteful number, since it uses less digits than its factorization.

82185540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369771 (or 1369769 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 82185540 is about 9065.6240822130. The cubic root of 82185540 is about 434.7755745500.

The spelling of 82185540 in words is "eighty-two million, one hundred eighty-five thousand, five hundred forty".