81335124 has 96 divisors (see below), whose sum is σ = 239120000. Its totient is φ = 23701248.

The previous prime is 81335113. The next prime is 81335129. The reversal of 81335124 is 42153318.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81335129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25152 + ... + 28200.

Almost surely, 2^81335124 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 81335124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119560000).

81335124 is an abundant number, since it is smaller than the sum of its proper divisors (157784876).

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

81335124 is a wasteful number, since it uses less digits than its factorization.

81335124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3094 (or 3086 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 81335124 is about 9018.5987825161. The cubic root of 81335124 is about 433.2707567759.

It can be divided in two parts, 813 and 35124, that added together give a cube (35937 = 33³).

The spelling of 81335124 in words is "eighty-one million, three hundred thirty-five thousand, one hundred twenty-four".