81875374 has 24 divisors (see below), whose sum is σ = 143250120. Its totient is φ = 34994736.

The previous prime is 81875369. The next prime is 81875411. The reversal of 81875374 is 47357818.

It is a self number, because there is not a number n which added to its sum of digits gives 81875374.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44872 + ... + 46660.

It is an arithmetic number, because the mean of its divisors is an integer number (5968755).

Almost surely, 2^81875374 is an apocalyptic number.

81875374 is a deficient number, since it is larger than the sum of its proper divisors (61374746).

81875374 is a wasteful number, since it uses less digits than its factorization.

81875374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272 (or 2265 counting only the distinct ones).

The product of its digits is 188160, while the sum is 43.

The square root of 81875374 is about 9048.5012018566. The cubic root of 81875374 is about 434.2279413094.

The spelling of 81875374 in words is "eighty-one million, eight hundred seventy-five thousand, three hundred seventy-four".