81967762 has 8 divisors (see below), whose sum is σ = 124169292. Its totient is φ = 40578000.

The previous prime is 81967747. The next prime is 81967763. The reversal of 81967762 is 26776918.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68211081 + 13756681 = 8259^2 + 3709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81967763) 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 3 ways as a sum of consecutive naturals, for example, 202689 + ... + 203092.

Almost surely, 2^81967762 is an apocalyptic number.

81967762 is a deficient number, since it is larger than the sum of its proper divisors (42201530).

81967762 is a wasteful number, since it uses less digits than its factorization.

81967762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405884.

The product of its digits is 254016, while the sum is 46.

The square root of 81967762 is about 9053.6049173796. The cubic root of 81967762 is about 434.3912072141.

The spelling of 81967762 in words is "eighty-one million, nine hundred sixty-seven thousand, seven hundred sixty-two".