81335056 has 20 divisors (see below), whose sum is σ = 171913104. Its totient is φ = 36970400.

The previous prime is 81335047. The next prime is 81335063. The reversal of 81335056 is 65053318.

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, 230890 + ... + 231241.

Almost surely, 2^81335056 is an apocalyptic number.

It is an amenable number.

81335056 is an abundant number, since it is smaller than the sum of its proper divisors (90578048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81335056 is a wasteful number, since it uses less digits than its factorization.

81335056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462150 (or 462144 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 81335056 is about 9018.5950125283. The cubic root of 81335056 is about 433.2706360309.

The spelling of 81335056 in words is "eighty-one million, three hundred thirty-five thousand, fifty-six".