81268885 has 8 divisors (see below), whose sum is σ = 97836120. Its totient is φ = 64806144.

The previous prime is 81268883. The next prime is 81268907. The reversal of 81268885 is 58886218.

It can be written as a sum of positive squares in 4 ways, for example, as 5943844 + 75325041 = 2438^2 + 8679^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 81268885 - 2¹ = 81268883 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 24400 + ... + 27529.

It is an arithmetic number, because the mean of its divisors is an integer number (12229515).

Almost surely, 2^81268885 is an apocalyptic number.

It is an amenable number.

81268885 is a deficient number, since it is larger than the sum of its proper divisors (16567235).

81268885 is a wasteful number, since it uses less digits than its factorization.

81268885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52247.

The product of its digits is 245760, while the sum is 46.

The square root of 81268885 is about 9014.9256791168. The cubic root of 81268885 is about 433.1531068412.

The spelling of 81268885 in words is "eighty-one million, two hundred sixty-eight thousand, eight hundred eighty-five".