81352578828 has 54 divisors (see below), whose sum is σ = 191537060988. Its totient is φ = 26874796800.

The previous prime is 81352578823. The next prime is 81352578833. The reversal of 81352578828 is 82887525318.

It is an interprime number because it is at equal distance from previous prime (81352578823) and next prime (81352578833).

It is not an unprimeable number, because it can be changed into a prime (81352578823) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 135361728 + ... + 135362328.

Almost surely, 2^81352578828 is an apocalyptic number.

It is an amenable number.

81352578828 is an abundant number, since it is smaller than the sum of its proper divisors (110184482160).

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

81352578828 is an equidigital number, since it uses as much as digits as its factorization.

81352578828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483 (or 743 counting only the distinct ones).

The product of its digits is 8601600, while the sum is 57.

The spelling of 81352578828 in words is "eighty-one billion, three hundred fifty-two million, five hundred seventy-eight thousand, eight hundred twenty-eight".