81875368 has 8 divisors (see below), whose sum is σ = 153516330. Its totient is φ = 40937680.

The previous prime is 81875357. The next prime is 81875369. The reversal of 81875368 is 86357818.

It can be written as a sum of positive squares in only one way, i.e., 55681444 + 26193924 = 7462^2 + 5118^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (81875369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5117203 + ... + 5117218.

Almost surely, 2^81875368 is an apocalyptic number.

It is an amenable number.

81875368 is a deficient number, since it is larger than the sum of its proper divisors (71640962).

81875368 is a wasteful number, since it uses less digits than its factorization.

81875368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10234427 (or 10234423 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 81875368 is about 9048.5008703100. The cubic root of 81875368 is about 434.2279307024.

The spelling of 81875368 in words is "eighty-one million, eight hundred seventy-five thousand, three hundred sixty-eight".