81498368 has 108 divisors (see below), whose sum is σ = 193985820. Its totient is φ = 34062336.

The previous prime is 81498367. The next prime is 81498371. The reversal of 81498368 is 86389418.

It can be written as a sum of positive squares in 2 ways, for example, as 30118144 + 51380224 = 5488^2 + 7168^2 .

Its product of digits (331776) is a multiple of the sum of its prime factors (192).

It is not an unprimeable number, because it can be changed into a prime (81498367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 915668 + ... + 915756.

It is an arithmetic number, because the mean of its divisors is an integer number (1796165).

Almost surely, 2^81498368 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 81498368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96992910).

81498368 is an abundant number, since it is smaller than the sum of its proper divisors (112487452).

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

81498368 is an equidigital number, since it uses as much as digits as its factorization.

81498368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 171 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 81498368 is about 9027.6446540612. The cubic root of 81498368 is about 433.5604290263.

The spelling of 81498368 in words is "eighty-one million, four hundred ninety-eight thousand, three hundred sixty-eight".