81127332 has 240 divisors, whose sum is σ = 266378112. Its totient is φ = 21150720.

The previous prime is 81127307. The next prime is 81127337. The reversal of 81127332 is 23372118.

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

It is a junction number, because it is equal to n+sod(n) for n = 81127296 and 81127305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81127337) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 787593 + ... + 787695.

Almost surely, 2^81127332 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 81127332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133189056).

81127332 is an abundant number, since it is smaller than the sum of its proper divisors (185250780).

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

81127332 is a wasteful number, since it uses less digits than its factorization.

81127332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 149 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 81127332 is about 9007.0712221010. The cubic root of 81127332 is about 432.9014740262.

The spelling of 81127332 in words is "eighty-one million, one hundred twenty-seven thousand, three hundred thirty-two".