81056635 has 16 divisors (see below), whose sum is σ = 106663392. Its totient is φ = 58643200.

The previous prime is 81056609. The next prime is 81056639. The reversal of 81056635 is 53665018.

It is not a de Polignac number, because 81056635 - 2⁹ = 81056123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81056635.

It is not an unprimeable number, because it can be changed into a prime (81056639) 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, 7095 + ... + 14575.

It is an arithmetic number, because the mean of its divisors is an integer number (6666462).

Almost surely, 2^81056635 is an apocalyptic number.

81056635 is a deficient number, since it is larger than the sum of its proper divisors (25606757).

81056635 is a wasteful number, since it uses less digits than its factorization.

81056635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7694.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 81056635 is about 9003.1458390942. The cubic root of 81056635 is about 432.7756893324.

The spelling of 81056635 in words is "eighty-one million, fifty-six thousand, six hundred thirty-five".