81268884 has 36 divisors (see below), whose sum is σ = 205855104. Its totient is φ = 27033552.

The previous prime is 81268883. The next prime is 81268907. The reversal of 81268884 is 48886218.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81268883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17629 + ... + 21755.

Almost surely, 2^81268884 is an apocalyptic number.

It is an amenable number.

81268884 is an abundant number, since it is smaller than the sum of its proper divisors (124586220).

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

81268884 is a wasteful number, since it uses less digits than its factorization.

81268884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684 (or 4679 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The square root of 81268884 is about 9014.9256236533. The cubic root of 81268884 is about 433.1531050646.

It can be divided in two parts, 812 and 68884, that added together give a palindrome (69696).

The spelling of 81268884 in words is "eighty-one million, two hundred sixty-eight thousand, eight hundred eighty-four".