81354056 has 16 divisors (see below), whose sum is σ = 174330240. Its totient is φ = 34866000.

The previous prime is 81354023. The next prime is 81354071. The reversal of 81354056 is 65045318.

It is a happy number.

It is a super-2 number, since 2×81354056² = 13236964855302272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726320 + ... + 726431.

It is an arithmetic number, because the mean of its divisors is an integer number (10895640).

Almost surely, 2^81354056 is an apocalyptic number.

It is an amenable number.

81354056 is an abundant number, since it is smaller than the sum of its proper divisors (92976184).

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

81354056 is a wasteful number, since it uses less digits than its factorization.

81354056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452764 (or 1452760 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 81354056 is about 9019.6483301734. The cubic root of 81354056 is about 433.3043709769.

The spelling of 81354056 in words is "eighty-one million, three hundred fifty-four thousand, fifty-six".