81536252 has 12 divisors (see below), whose sum is σ = 163072560. Its totient is φ = 34944096.

The previous prime is 81536183. The next prime is 81536269. The reversal of 81536252 is 25263518.

81536252 is an admirable number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1455977 + ... + 1456032.

It is an arithmetic number, because the mean of its divisors is an integer number (13589380).

Almost surely, 2^81536252 is an apocalyptic number.

It is an amenable number.

81536252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81536252 is a wasteful number, since it uses less digits than its factorization.

81536252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912020 (or 2912018 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 81536252 is about 9029.7426319912. The cubic root of 81536252 is about 433.6275978926.

The spelling of 81536252 in words is "eighty-one million, five hundred thirty-six thousand, two hundred fifty-two".