71865089 has 4 divisors (see below), whose sum is σ = 71942724. Its totient is φ = 71787456.

The previous prime is 71865061. The next prime is 71865091. The reversal of 71865089 is 98056817.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11336689 + 60528400 = 3367^2 + 7780^2 .

It is a cyclic number.

It is not a de Polignac number, because 71865089 - 2²⁴ = 55087873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71865019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37412 + ... + 39285.

It is an arithmetic number, because the mean of its divisors is an integer number (17985681).

Almost surely, 2^71865089 is an apocalyptic number.

It is an amenable number.

71865089 is a deficient number, since it is larger than the sum of its proper divisors (77635).

71865089 is an equidigital number, since it uses as much as digits as its factorization.

71865089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77634.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 71865089 is about 8477.3279398641. The cubic root of 71865089 is about 415.7567630853.

The spelling of 71865089 in words is "seventy-one million, eight hundred sixty-five thousand, eighty-nine".