81498660 has 96 divisors (see below), whose sum is σ = 241678080. Its totient is φ = 20477952.

The previous prime is 81498607. The next prime is 81498701. The reversal of 81498660 is 6689418.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100336 + ... + 101144.

It is an arithmetic number, because the mean of its divisors is an integer number (2517480).

Almost surely, 2^81498660 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 81498660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120839040).

81498660 is an abundant number, since it is smaller than the sum of its proper divisors (160179420).

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

81498660 is a wasteful number, since it uses less digits than its factorization.

81498660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 81498660 is about 9027.6608265929. The cubic root of 81498660 is about 433.5609468261.

The spelling of 81498660 in words is "eighty-one million, four hundred ninety-eight thousand, six hundred sixty".