71217873 has 20 divisors (see below), whose sum is σ = 106743780. Its totient is φ = 47319552.

The previous prime is 71217857. The next prime is 71217907. The reversal of 71217873 is 37871217.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26501904 + 44715969 = 5148^2 + 6687^2 .

It is not a de Polignac number, because 71217873 - 2⁴ = 71217857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71217673) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25993 + ... + 28601.

It is an arithmetic number, because the mean of its divisors is an integer number (5337189).

Almost surely, 2^71217873 is an apocalyptic number.

It is an amenable number.

71217873 is a deficient number, since it is larger than the sum of its proper divisors (35525907).

71217873 is a wasteful number, since it uses less digits than its factorization.

71217873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2958 (or 2949 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 71217873 is about 8439.0682542565. The cubic root of 71217873 is about 414.5048975448.

The spelling of 71217873 in words is "seventy-one million, two hundred seventeen thousand, eight hundred seventy-three".