71647313 has 6 divisors (see below), whose sum is σ = 74203974. Its totient is φ = 69175904.

The previous prime is 71647291. The next prime is 71647319. The reversal of 71647313 is 31374617.

It can be written as a sum of positive squares in 3 ways, for example, as 15816529 + 55830784 = 3977^2 + 7472^2 .

It is not a de Polignac number, because 71647313 - 2⁸ = 71647057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71647313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71647319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41756 + ... + 43437.

It is an arithmetic number, because the mean of its divisors is an integer number (12367329).

Almost surely, 2^71647313 is an apocalyptic number.

It is an amenable number.

71647313 is a deficient number, since it is larger than the sum of its proper divisors (2556661).

71647313 is an equidigital number, since it uses as much as digits as its factorization.

71647313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85251 (or 85222 counting only the distinct ones).

The product of its digits is 10584, while the sum is 32.

The square root of 71647313 is about 8464.4735807964. The cubic root of 71647313 is about 415.3363760423.

The spelling of 71647313 in words is "seventy-one million, six hundred forty-seven thousand, three hundred thirteen".