81705652 has 12 divisors (see below), whose sum is σ = 163411360. Its totient is φ = 35016696.

The previous prime is 81705623. The next prime is 81705653. The reversal of 81705652 is 25650718.

81705652 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81705653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1459002 + ... + 1459057.

Almost surely, 2^81705652 is an apocalyptic number.

It is an amenable number.

81705652 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.

81705652 is a wasteful number, since it uses less digits than its factorization.

81705652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918070 (or 2918068 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 81705652 is about 9039.1178773152. The cubic root of 81705652 is about 433.9276922299.

The spelling of 81705652 in words is "eighty-one million, seven hundred five thousand, six hundred fifty-two".