81798150 has 144 divisors (see below), whose sum is σ = 244270080. Its totient is φ = 18043200.

The previous prime is 81798137. The next prime is 81798151. The reversal of 81798150 is 5189718.

It is a junction number, because it is equal to n+sod(n) for n = 81798099 and 81798108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81798151) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 227671 + ... + 228029.

It is an arithmetic number, because the mean of its divisors is an integer number (1696320).

Almost surely, 2^81798150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81798150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122135040).

81798150 is an abundant number, since it is smaller than the sum of its proper divisors (162471930).

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

81798150 is a wasteful number, since it uses less digits than its factorization.

81798150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 81798150 is about 9044.2329691356. The cubic root of 81798150 is about 434.0913786084.

The spelling of 81798150 in words is "eighty-one million, seven hundred ninety-eight thousand, one hundred fifty".