81255648 has 48 divisors (see below), whose sum is σ = 225847440. Its totient is φ = 25491456.

The previous prime is 81255641. The next prime is 81255653. The reversal of 81255648 is 84655218.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81255641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23263 + ... + 26526.

It is an arithmetic number, because the mean of its divisors is an integer number (4705155).

Almost surely, 2^81255648 is an apocalyptic number.

It is an amenable number.

81255648 is an abundant number, since it is smaller than the sum of its proper divisors (144591792).

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

81255648 is a wasteful number, since it uses less digits than its factorization.

81255648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49819 (or 49811 counting only the distinct ones).

The product of its digits is 76800, while the sum is 39.

The square root of 81255648 is about 9014.1914778864. The cubic root of 81255648 is about 433.1295883732.

The spelling of 81255648 in words is "eighty-one million, two hundred fifty-five thousand, six hundred forty-eight".