82181140 has 24 divisors (see below), whose sum is σ = 172781280. Its totient is φ = 32834208.

The previous prime is 82181131. The next prime is 82181153. The reversal of 82181140 is 4118128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20631 + ... + 24289.

It is an arithmetic number, because the mean of its divisors is an integer number (7199220).

Almost surely, 2^82181140 is an apocalyptic number.

It is an amenable number.

82181140 is an abundant number, since it is smaller than the sum of its proper divisors (90600140).

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

82181140 is a wasteful number, since it uses less digits than its factorization.

82181140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4791 (or 4789 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 82181140 is about 9065.3814040006. The cubic root of 82181140 is about 434.7678154938.

Adding to 82181140 its reverse (4118128), we get a palindrome (86299268).

The spelling of 82181140 in words is "eighty-two million, one hundred eighty-one thousand, one hundred forty".