81956448 has 120 divisors (see below), whose sum is σ = 275525712. Its totient is φ = 23410944.

The previous prime is 81956411. The next prime is 81956449. The reversal of 81956448 is 84465918.

81956448 is a `hidden beast` number, since 81 + 9 + 564 + 4 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81956449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15886 + ... + 20402.

Almost surely, 2^81956448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81956448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137762856).

81956448 is an abundant number, since it is smaller than the sum of its proper divisors (193569264).

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

81956448 is a wasteful number, since it uses less digits than its factorization.

81956448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546 (or 4529 counting only the distinct ones).

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

The square root of 81956448 is about 9052.9800618360. The cubic root of 81956448 is about 434.3712199730.

The spelling of 81956448 in words is "eighty-one million, nine hundred fifty-six thousand, four hundred forty-eight".