81456120 has 48 divisors (see below), whose sum is σ = 264733560. Its totient is φ = 21721536.

The previous prime is 81456119. The next prime is 81456139. The reversal of 81456120 is 2165418.

81456120 is a `hidden beast` number, since 8 + 1 + 45 + 612 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112774 + ... + 113493.

Almost surely, 2^81456120 is an apocalyptic number.

It is an amenable number.

81456120 is an abundant number, since it is smaller than the sum of its proper divisors (183277440).

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

81456120 is a wasteful number, since it uses less digits than its factorization.

81456120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226284 (or 226277 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 81456120 is about 9025.3044269986. The cubic root of 81456120 is about 433.4854981719.

The spelling of 81456120 in words is "eighty-one million, four hundred fifty-six thousand, one hundred twenty".