81255768 has 64 divisors (see below), whose sum is σ = 227041920. Its totient is φ = 24019200.

The previous prime is 81255751. The next prime is 81255781. The reversal of 81255768 is 86755218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7071 + ... + 14577.

It is an arithmetic number, because the mean of its divisors is an integer number (3547530).

Almost surely, 2^81255768 is an apocalyptic number.

81255768 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81255768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113520960).

81255768 is an abundant number, since it is smaller than the sum of its proper divisors (145786152).

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

81255768 is a wasteful number, since it uses less digits than its factorization.

81255768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7568 (or 7564 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 81255768 is about 9014.1981340550. The cubic root of 81255768 is about 433.1298015913.

The spelling of 81255768 in words is "eighty-one million, two hundred fifty-five thousand, seven hundred sixty-eight".