81298368 has 168 divisors, whose sum is σ = 250423680. Its totient is φ = 25159680.

The previous prime is 81298363. The next prime is 81298379. The reversal of 81298368 is 86389218.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81298363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 517746 + ... + 517902.

Almost surely, 2^81298368 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 81298368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125211840).

81298368 is an abundant number, since it is smaller than the sum of its proper divisors (169125312).

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

81298368 is a wasteful number, since it uses less digits than its factorization.

81298368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 222 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 81298368 is about 9016.5607633953. The cubic root of 81298368 is about 433.2054807562.

The spelling of 81298368 in words is "eighty-one million, two hundred ninety-eight thousand, three hundred sixty-eight".