71640347 has 2 divisors, whose sum is σ = 71640348. Its totient is φ = 71640346.

The previous prime is 71640341. The next prime is 71640419. The reversal of 71640347 is 74304617.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71640347 - 2¹⁴ = 71623963 is a prime.

It is not a weakly prime, because it can be changed into another prime (71640341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35820173 + 35820174.

It is an arithmetic number, because the mean of its divisors is an integer number (35820174).

Almost surely, 2^71640347 is an apocalyptic number.

71640347 is a deficient number, since it is larger than the sum of its proper divisors (1).

71640347 is an equidigital number, since it uses as much as digits as its factorization.

71640347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 71640347 is about 8464.0620862562. The cubic root of 71640347 is about 415.3229150724.

The spelling of 71640347 in words is "seventy-one million, six hundred forty thousand, three hundred forty-seven".