81032885 has 4 divisors (see below), whose sum is σ = 97239468. Its totient is φ = 64826304.

The previous prime is 81032867. The next prime is 81032893. The reversal of 81032885 is 58823018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28121809 + 52911076 = 5303^2 + 7274^2 .

It is a cyclic number.

It is not a de Polignac number, because 81032885 - 2⁶ = 81032821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8103284 + ... + 8103293.

It is an arithmetic number, because the mean of its divisors is an integer number (24309867).

Almost surely, 2^81032885 is an apocalyptic number.

It is an amenable number.

81032885 is a deficient number, since it is larger than the sum of its proper divisors (16206583).

81032885 is a wasteful number, since it uses less digits than its factorization.

81032885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16206582.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 81032885 is about 9001.8267590529. The cubic root of 81032885 is about 432.7334167220.

The spelling of 81032885 in words is "eighty-one million, thirty-two thousand, eight hundred eighty-five".