81767252 has 48 divisors (see below), whose sum is σ = 169099392. Its totient is φ = 33868800.

The previous prime is 81767251. The next prime is 81767419. The reversal of 81767252 is 25276718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81767251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135752 + ... + 136352.

It is an arithmetic number, because the mean of its divisors is an integer number (3522904).

Almost surely, 2^81767252 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 81767252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84549696).

81767252 is an abundant number, since it is smaller than the sum of its proper divisors (87332140).

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

81767252 is a wasteful number, since it uses less digits than its factorization.

81767252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768 (or 766 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 81767252 is about 9042.5246474643. The cubic root of 81767252 is about 434.0367145988.

The spelling of 81767252 in words is "eighty-one million, seven hundred sixty-seven thousand, two hundred fifty-two".