81803875 has 16 divisors (see below), whose sum is σ = 102915072. Its totient is φ = 64915200.

The previous prime is 81803861. The next prime is 81803879. The reversal of 81803875 is 57830818.

It is not a de Polignac number, because 81803875 - 2¹¹ = 81801827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81803879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13299 + ... + 18451.

It is an arithmetic number, because the mean of its divisors is an integer number (6432192).

Almost surely, 2^81803875 is an apocalyptic number.

81803875 is a deficient number, since it is larger than the sum of its proper divisors (21111197).

81803875 is a wasteful number, since it uses less digits than its factorization.

81803875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5295 (or 5285 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 81803875 is about 9044.5494636273. The cubic root of 81803875 is about 434.1015056311.

The spelling of 81803875 in words is "eighty-one million, eight hundred three thousand, eight hundred seventy-five".