81707834 has 16 divisors (see below), whose sum is σ = 135210600. Its totient is φ = 36791040.

The previous prime is 81707833. The next prime is 81707867. The reversal of 81707834 is 43870718.

It can be written as a sum of positive squares in 4 ways, for example, as 56175025 + 25532809 = 7495^2 + 5053^2 .

It is not an unprimeable number, because it can be changed into a prime (81707833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37259 + ... + 39390.

Almost surely, 2^81707834 is an apocalyptic number.

81707834 is a deficient number, since it is larger than the sum of its proper divisors (53502766).

81707834 is a wasteful number, since it uses less digits than its factorization.

81707834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76705.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 81707834 is about 9039.2385741278. The cubic root of 81707834 is about 433.9315549647.

The spelling of 81707834 in words is "eighty-one million, seven hundred seven thousand, eight hundred thirty-four".