81694035 has 32 divisors (see below), whose sum is σ = 145658880. Its totient is φ = 43442784.

The previous prime is 81694033. The next prime is 81694051. The reversal of 81694035 is 53049618.

It is not a de Polignac number, because 81694035 - 2¹ = 81694033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81694031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61852 + ... + 63158.

It is an arithmetic number, because the mean of its divisors is an integer number (4551840).

Almost surely, 2^81694035 is an apocalyptic number.

81694035 is a deficient number, since it is larger than the sum of its proper divisors (63964845).

81694035 is a wasteful number, since it uses less digits than its factorization.

81694035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 81694035 is about 9038.4752585821. The cubic root of 81694035 is about 433.9071258154.

The spelling of 81694035 in words is "eighty-one million, six hundred ninety-four thousand, thirty-five".