81494856 has 32 divisors (see below), whose sum is σ = 226375200. Its totient is φ = 27164880.

The previous prime is 81494827. The next prime is 81494863. The reversal of 81494856 is 65849418.

81494856 is a `hidden beast` number, since 81 + 494 + 85 + 6 = 666.

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, 188430 + ... + 188861.

It is an arithmetic number, because the mean of its divisors is an integer number (7074225).

Almost surely, 2^81494856 is an apocalyptic number.

It is an amenable number.

81494856 is an abundant number, since it is smaller than the sum of its proper divisors (144880344).

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

81494856 is a wasteful number, since it uses less digits than its factorization.

81494856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377306 (or 377296 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 81494856 is about 9027.4501383281. The cubic root of 81494856 is about 433.5542011466.

The spelling of 81494856 in words is "eighty-one million, four hundred ninety-four thousand, eight hundred fifty-six".