81407935 has 16 divisors (see below), whose sum is σ = 111983616. Its totient is φ = 55653408.

The previous prime is 81407903. The next prime is 81407939. The reversal of 81407935 is 53970418.

It is a cyclic number.

It is not a de Polignac number, because 81407935 - 2⁵ = 81407903 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81407894 and 81407903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81407939) 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, 8794 + ... + 15496.

It is an arithmetic number, because the mean of its divisors is an integer number (6998976).

Almost surely, 2^81407935 is an apocalyptic number.

81407935 is a deficient number, since it is larger than the sum of its proper divisors (30575681).

81407935 is a wasteful number, since it uses less digits than its factorization.

81407935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7062.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 81407935 is about 9022.6345930665. The cubic root of 81407935 is about 433.4000058491.

The spelling of 81407935 in words is "eighty-one million, four hundred seven thousand, nine hundred thirty-five".