81330875 has 16 divisors (see below), whose sum is σ = 105917760. Its totient is φ = 62233600.

The previous prime is 81330863. The next prime is 81330923. The reversal of 81330875 is 57803318.

It is not a de Polignac number, because 81330875 - 2¹⁴ = 81314491 is a prime.

It is a super-2 number, since 2×81330875² = 13229422456531250, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 11270 + ... + 17019.

It is an arithmetic number, because the mean of its divisors is an integer number (6619860).

Almost surely, 2^81330875 is an apocalyptic number.

81330875 is a deficient number, since it is larger than the sum of its proper divisors (24586885).

81330875 is a wasteful number, since it uses less digits than its factorization.

81330875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28327 (or 28317 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 81330875 is about 9018.3632106941. The cubic root of 81330875 is about 433.2632118621.

The spelling of 81330875 in words is "eighty-one million, three hundred thirty thousand, eight hundred seventy-five".