81907735 has 32 divisors (see below), whose sum is σ = 124895232. Its totient is φ = 50163840.

The previous prime is 81907697. The next prime is 81907741. The reversal of 81907735 is 53770918.

It is not a de Polignac number, because 81907735 - 2⁷ = 81907607 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11202 + ... + 17008.

It is an arithmetic number, because the mean of its divisors is an integer number (3902976).

Almost surely, 2^81907735 is an apocalyptic number.

81907735 is a deficient number, since it is larger than the sum of its proper divisors (42987497).

81907735 is a wasteful number, since it uses less digits than its factorization.

81907735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5863.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 81907735 is about 9050.2892218978. The cubic root of 81907735 is about 434.2851428780.

The spelling of 81907735 in words is "eighty-one million, nine hundred seven thousand, seven hundred thirty-five".