81759152 has 20 divisors (see below), whose sum is σ = 163519296. Its totient is φ = 39560640.

The previous prime is 81759151. The next prime is 81759157. The reversal of 81759152 is 25195718.

81759152 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81759151) 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, 81923 + ... + 82914.

Almost surely, 2^81759152 is an apocalyptic number.

It is an amenable number.

81759152 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.

81759152 is a wasteful number, since it uses less digits than its factorization.

81759152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164876 (or 164870 counting only the distinct ones).

The product of its digits is 25200, while the sum is 38.

The square root of 81759152 is about 9042.0767526050. The cubic root of 81759152 is about 434.0223819925.

The spelling of 81759152 in words is "eighty-one million, seven hundred fifty-nine thousand, one hundred fifty-two".