81875030 has 16 divisors (see below), whose sum is σ = 152129664. Its totient is φ = 31693440.

The previous prime is 81875021. The next prime is 81875071. The reversal of 81875030 is 3057818.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 131747 + ... + 132366.

It is an arithmetic number, because the mean of its divisors is an integer number (9508104).

Almost surely, 2^81875030 is an apocalyptic number.

81875030 is a deficient number, since it is larger than the sum of its proper divisors (70254634).

81875030 is a wasteful number, since it uses less digits than its factorization.

81875030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264151.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 81875030 is about 9048.4821931637. The cubic root of 81875030 is about 434.2273331712.

The spelling of 81875030 in words is "eighty-one million, eight hundred seventy-five thousand, thirty".