81855832 has 32 divisors (see below), whose sum is σ = 158202000. Its totient is φ = 39682944.

The previous prime is 81855817. The next prime is 81855859. The reversal of 81855832 is 23855818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50458 + ... + 52054.

Almost surely, 2^81855832 is an apocalyptic number.

It is an amenable number.

81855832 is a deficient number, since it is larger than the sum of its proper divisors (76346168).

81855832 is a wasteful number, since it uses less digits than its factorization.

81855832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795 (or 1791 counting only the distinct ones).

The product of its digits is 76800, while the sum is 40.

The square root of 81855832 is about 9047.4212900693. The cubic root of 81855832 is about 434.1933914107.

The spelling of 81855832 in words is "eighty-one million, eight hundred fifty-five thousand, eight hundred thirty-two".