81046785 has 16 divisors (see below), whose sum is σ = 130337856. Its totient is φ = 43003968.

The previous prime is 81046783. The next prime is 81046843. The reversal of 81046785 is 58764018.

It is not a de Polignac number, because 81046785 - 2¹ = 81046783 is a prime.

It is a super-3 number, since 3×81046785³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81046781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10759 + ... + 16668.

It is an arithmetic number, because the mean of its divisors is an integer number (8146116).

Almost surely, 2^81046785 is an apocalyptic number.

It is an amenable number.

81046785 is a deficient number, since it is larger than the sum of its proper divisors (49291071).

81046785 is a wasteful number, since it uses less digits than its factorization.

81046785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27632.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 81046785 is about 9002.5987914602. The cubic root of 81046785 is about 432.7581583258.

The spelling of 81046785 in words is "eighty-one million, forty-six thousand, seven hundred eighty-five".