81255552 has 256 divisors, whose sum is σ = 272870400. Its totient is φ = 20901888.

The previous prime is 81255547. The next prime is 81255583. The reversal of 81255552 is 25555218.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 1889643 + ... + 1889685.

It is an arithmetic number, because the mean of its divisors is an integer number (1065900).

Almost surely, 2^81255552 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 81255552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136435200).

81255552 is an abundant number, since it is smaller than the sum of its proper divisors (191614848).

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

81255552 is a wasteful number, since it uses less digits than its factorization.

81255552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 111 counting only the distinct ones).

The product of its digits is 20000, while the sum is 33.

The square root of 81255552 is about 9014.1861529480. The cubic root of 81255552 is about 433.1294177986.

The spelling of 81255552 in words is "eighty-one million, two hundred fifty-five thousand, five hundred fifty-two".