81611752 has 16 divisors (see below), whose sum is σ = 153360900. Its totient is φ = 40715520.

The previous prime is 81611749. The next prime is 81611753. The reversal of 81611752 is 25711618.

It can be written as a sum of positive squares in 2 ways, for example, as 78393316 + 3218436 = 8854^2 + 1794^2 .

It is not an unprimeable number, because it can be changed into a prime (81611753) 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, 7377 + ... + 14752.

Almost surely, 2^81611752 is an apocalyptic number.

It is an amenable number.

81611752 is a deficient number, since it is larger than the sum of its proper divisors (71749148).

81611752 is a wasteful number, since it uses less digits than its factorization.

81611752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22596 (or 22592 counting only the distinct ones).

The product of its digits is 3360, while the sum is 31.

The square root of 81611752 is about 9033.9222932235. The cubic root of 81611752 is about 433.7613984331.

The spelling of 81611752 in words is "eighty-one million, six hundred eleven thousand, seven hundred fifty-two".