71045865 has 24 divisors (see below), whose sum is σ = 134342208. Its totient is φ = 34446240.

The previous prime is 71045837. The next prime is 71045869. The reversal of 71045865 is 56854017.

71045865 is a `hidden beast` number, since 71 + 0 + 4 + 586 + 5 = 666.

It is not a de Polignac number, because 71045865 - 2⁵ = 71045833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71045869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71269 + ... + 72258.

It is an arithmetic number, because the mean of its divisors is an integer number (5597592).

Almost surely, 2^71045865 is an apocalyptic number.

It is an amenable number.

71045865 is a deficient number, since it is larger than the sum of its proper divisors (63296343).

71045865 is a wasteful number, since it uses less digits than its factorization.

71045865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143549 (or 143546 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 71045865 is about 8428.8709208292. The cubic root of 71045865 is about 414.1709194145.

The spelling of 71045865 in words is "seventy-one million, forty-five thousand, eight hundred sixty-five".