81336150 has 240 divisors, whose sum is σ = 273672960. Its totient is φ = 17496000.

The previous prime is 81336139. The next prime is 81336173. The reversal of 81336150 is 5163318.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 538575 + ... + 538725.

It is an arithmetic number, because the mean of its divisors is an integer number (1140304).

Almost surely, 2^81336150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81336150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136836480).

81336150 is an abundant number, since it is smaller than the sum of its proper divisors (192336810).

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

81336150 is a wasteful number, since it uses less digits than its factorization.

81336150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 81336150 is about 9018.6556647873. The cubic root of 81336150 is about 433.2725785961.

Adding to 81336150 its reverse (5163318), we get a palindrome (86499468).

It can be divided in two parts, 813 and 36150, that added together give a palindrome (36963).

The spelling of 81336150 in words is "eighty-one million, three hundred thirty-six thousand, one hundred fifty".