81886252 has 36 divisors (see below), whose sum is σ = 172087104. Its totient is φ = 33959520.

The previous prime is 81886249. The next prime is 81886253. The reversal of 81886252 is 25268818.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81886253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 663 + ... + 12814.

Almost surely, 2^81886252 is an apocalyptic number.

It is an amenable number.

81886252 is an abundant number, since it is smaller than the sum of its proper divisors (90200852).

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

81886252 is a wasteful number, since it uses less digits than its factorization.

81886252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13526 (or 13517 counting only the distinct ones).

The product of its digits is 61440, while the sum is 40.

The square root of 81886252 is about 9049.1022759167. The cubic root of 81886252 is about 434.2471710328.

The spelling of 81886252 in words is "eighty-one million, eight hundred eighty-six thousand, two hundred fifty-two".