81262340 has 48 divisors (see below), whose sum is σ = 175271040. Its totient is φ = 31637760.

The previous prime is 81262333. The next prime is 81262343. The reversal of 81262340 is 4326218.

It is not an unprimeable number, because it can be changed into a prime (81262343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126059 + ... + 126701.

It is an arithmetic number, because the mean of its divisors is an integer number (3651480).

Almost surely, 2^81262340 is an apocalyptic number.

It is an amenable number.

81262340 is an abundant number, since it is smaller than the sum of its proper divisors (94008700).

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

81262340 is a wasteful number, since it uses less digits than its factorization.

81262340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 81262340 is about 9014.5626627141. The cubic root of 81262340 is about 433.1414785155.

Adding to 81262340 its reverse (4326218), we get a palindrome (85588558).

The spelling of 81262340 in words is "eighty-one million, two hundred sixty-two thousand, three hundred forty".