81755052 has 24 divisors (see below), whose sum is σ = 195918576. Its totient is φ = 26515008.

The previous prime is 81755039. The next prime is 81755053. The reversal of 81755052 is 25055718.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81755053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91623 + ... + 92510.

It is an arithmetic number, because the mean of its divisors is an integer number (8163274).

Almost surely, 2^81755052 is an apocalyptic number.

It is an amenable number.

81755052 is an abundant number, since it is smaller than the sum of its proper divisors (114163524).

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

81755052 is a wasteful number, since it uses less digits than its factorization.

81755052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184177 (or 184175 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 81755052 is about 9041.8500319348. The cubic root of 81755052 is about 434.0151268557.

The spelling of 81755052 in words is "eighty-one million, seven hundred fifty-five thousand, fifty-two".