81328452888 has 16 divisors (see below), whose sum is σ = 203321132280. Its totient is φ = 27109484288.

The previous prime is 81328452869. The next prime is 81328452937. The reversal of 81328452888 is 88825482318.

It is a happy number.

It is a super-2 number, since 2×81328452888² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1694342745 + ... + 1694342792.

Almost surely, 2^81328452888 is an apocalyptic number.

It is an amenable number.

81328452888 is an abundant number, since it is smaller than the sum of its proper divisors (121992679392).

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

81328452888 is a wasteful number, since it uses less digits than its factorization.

81328452888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388685546 (or 3388685542 counting only the distinct ones).

The product of its digits is 7864320, while the sum is 57.

The spelling of 81328452888 in words is "eighty-one billion, three hundred twenty-eight million, four hundred fifty-two thousand, eight hundred eighty-eight".