81341340 has 48 divisors (see below), whose sum is σ = 237662208. Its totient is φ = 20747584.

The previous prime is 81341333. The next prime is 81341347. The reversal of 81341340 is 4314318.

It is an interprime number because it is at equal distance from previous prime (81341333) and next prime (81341347).

It is a self number, because there is not a number n which added to its sum of digits gives 81341340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81341347) 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, 28092 + ... + 30851.

It is an arithmetic number, because the mean of its divisors is an integer number (4951296).

Almost surely, 2^81341340 is an apocalyptic number.

It is an amenable number.

81341340 is an abundant number, since it is smaller than the sum of its proper divisors (156320868).

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

81341340 is a wasteful number, since it uses less digits than its factorization.

81341340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58978 (or 58976 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 81341340 is about 9018.9433970948. The cubic root of 81341340 is about 433.2817940018.

Adding to 81341340 its reverse (4314318), we get a palindrome (85655658).

The spelling of 81341340 in words is "eighty-one million, three hundred forty-one thousand, three hundred forty".