81025875 has 48 divisors (see below), whose sum is σ = 166944960. Its totient is φ = 37036800.

The previous prime is 81025871. The next prime is 81025891. The reversal of 81025875 is 57852018.

It is not a de Polignac number, because 81025875 - 2² = 81025871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81025871) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2731 + ... + 13019.

It is an arithmetic number, because the mean of its divisors is an integer number (3478020).

Almost surely, 2^81025875 is an apocalyptic number.

81025875 is an abundant number, since it is smaller than the sum of its proper divisors (85919085).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81025875 is a wasteful number, since it uses less digits than its factorization.

81025875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10317 (or 10304 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 81025875 is about 9001.4373852180. The cubic root of 81025875 is about 432.7209380486.

The spelling of 81025875 in words is "eighty-one million, twenty-five thousand, eight hundred seventy-five".