81226735 has 16 divisors (see below), whose sum is σ = 99580320. Its totient is φ = 63590400.

The previous prime is 81226693. The next prime is 81226741. The reversal of 81226735 is 53762218.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-81226735 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81226735.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49935 + ... + 51535.

It is an arithmetic number, because the mean of its divisors is an integer number (6223770).

Almost surely, 2^81226735 is an apocalyptic number.

81226735 is a deficient number, since it is larger than the sum of its proper divisors (18353585).

81226735 is a wasteful number, since it uses less digits than its factorization.

81226735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818.

The product of its digits is 20160, while the sum is 34.

The square root of 81226735 is about 9012.5875862596. The cubic root of 81226735 is about 433.0782091287.

The spelling of 81226735 in words is "eighty-one million, two hundred twenty-six thousand, seven hundred thirty-five".