81287875375 has 32 divisors (see below), whose sum is σ = 116097546240. Its totient is φ = 55664388000.

The previous prime is 81287875369. The next prime is 81287875433. The reversal of 81287875375 is 57357878218.

It is not a de Polignac number, because 81287875375 - 2⁵ = 81287875343 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 583770 + ... + 709480.

It is an arithmetic number, because the mean of its divisors is an integer number (3628048320).

Almost surely, 2^81287875375 is an apocalyptic number.

81287875375 is a deficient number, since it is larger than the sum of its proper divisors (34809670865).

81287875375 is a wasteful number, since it uses less digits than its factorization.

81287875375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126472 (or 126462 counting only the distinct ones).

The product of its digits is 26342400, while the sum is 61.

The spelling of 81287875375 in words is "eighty-one billion, two hundred eighty-seven million, eight hundred seventy-five thousand, three hundred seventy-five".