81340630 has 16 divisors (see below), whose sum is σ = 167329440. Its totient is φ = 27888192.

The previous prime is 81340619. The next prime is 81340657. The reversal of 81340630 is 3604318.

It is a junction number, because it is equal to n+sod(n) for n = 81340595 and 81340604.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 580935 + ... + 581074.

It is an arithmetic number, because the mean of its divisors is an integer number (10458090).

Almost surely, 2^81340630 is an apocalyptic number.

81340630 is an abundant number, since it is smaller than the sum of its proper divisors (85988810).

81340630 is a wasteful number, since it uses less digits than its factorization.

81340630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162023.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 81340630 is about 9018.9040354136. The cubic root of 81340630 is about 433.2805333432.

Adding to 81340630 its reverse (3604318), we get a palindrome (84944948).

The spelling of 81340630 in words is "eighty-one million, three hundred forty thousand, six hundred thirty".