82731240 has 64 divisors (see below), whose sum is σ = 275774400. Its totient is φ = 22061376.

The previous prime is 82731211. The next prime is 82731241. The reversal of 82731240 is 4213728.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (82731241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37222 + ... + 39381.

It is an arithmetic number, because the mean of its divisors is an integer number (4308975).

Almost surely, 2^82731240 is an apocalyptic number.

It is an amenable number.

82731240 is an abundant number, since it is smaller than the sum of its proper divisors (193043160).

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

82731240 is a wasteful number, since it uses less digits than its factorization.

82731240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76623 (or 76613 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 82731240 is about 9095.6714980259. The cubic root of 82731240 is about 435.7357347038.

Adding to 82731240 its reverse (4213728), we get a palindrome (86944968).

The spelling of 82731240 in words is "eighty-two million, seven hundred thirty-one thousand, two hundred forty".