81498312 has 192 divisors, whose sum is σ = 268894080. Its totient is φ = 22643712.

The previous prime is 81498311. The next prime is 81498343. The reversal of 81498312 is 21389418.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is not an unprimeable number, because it can be changed into a prime (81498311) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 721168 + ... + 721280.

It is an arithmetic number, because the mean of its divisors is an integer number (1400490).

Almost surely, 2^81498312 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 81498312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134447040).

81498312 is an abundant number, since it is smaller than the sum of its proper divisors (187395768).

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

81498312 is a wasteful number, since it uses less digits than its factorization.

81498312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 178 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 81498312 is about 9027.6415524765. The cubic root of 81498312 is about 433.5603297221.

It can be divided in two parts, 81498 and 312, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 81498312 in words is "eighty-one million, four hundred ninety-eight thousand, three hundred twelve".