71865863 has 2 divisors, whose sum is σ = 71865864. Its totient is φ = 71865862.

The previous prime is 71865841. The next prime is 71865887. The reversal of 71865863 is 36856817.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71865863 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71825863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35932931 + 35932932.

It is an arithmetic number, because the mean of its divisors is an integer number (35932932).

Almost surely, 2^71865863 is an apocalyptic number.

71865863 is a deficient number, since it is larger than the sum of its proper divisors (1).

71865863 is an equidigital number, since it uses as much as digits as its factorization.

71865863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 71865863 is about 8477.3735909184. The cubic root of 71865863 is about 415.7582556718.

The spelling of 71865863 in words is "seventy-one million, eight hundred sixty-five thousand, eight hundred sixty-three".