81013600 has 36 divisors (see below), whose sum is σ = 197776404. Its totient is φ = 32405120.

The previous prime is 81013589. The next prime is 81013601. The reversal of 81013600 is 631018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81013601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49834 + ... + 51433.

It is an arithmetic number, because the mean of its divisors is an integer number (5493789).

Almost surely, 2^81013600 is an apocalyptic number.

81013600 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81013600 is an abundant number, since it is smaller than the sum of its proper divisors (116762804).

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

81013600 is a wasteful number, since it uses less digits than its factorization.

81013600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101287 (or 101274 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 81013600 is about 9000.7555238435. The cubic root of 81013600 is about 432.6990852854.

Adding to 81013600 its reverse (631018), we get a palindrome (81644618).

The spelling of 81013600 in words is "eighty-one million, thirteen thousand, six hundred".