81785852 has 6 divisors (see below), whose sum is σ = 143125248. Its totient is φ = 40892924.

The previous prime is 81785839. The next prime is 81785863. The reversal of 81785852 is 25858718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223228 + ... + 10223235.

It is an arithmetic number, because the mean of its divisors is an integer number (23854208).

Almost surely, 2^81785852 is an apocalyptic number.

It is an amenable number.

81785852 is a deficient number, since it is larger than the sum of its proper divisors (61339396).

81785852 is a wasteful number, since it uses less digits than its factorization.

81785852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20446467 (or 20446465 counting only the distinct ones).

The product of its digits is 179200, while the sum is 44.

The square root of 81785852 is about 9043.5530628177. The cubic root of 81785852 is about 434.0696229275.

The spelling of 81785852 in words is "eighty-one million, seven hundred eighty-five thousand, eight hundred fifty-two".