71684287 has 2 divisors, whose sum is σ = 71684288. Its totient is φ = 71684286.

The previous prime is 71684279. The next prime is 71684293. The reversal of 71684287 is 78248617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71684287 - 2³ = 71684279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71684237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35842143 + 35842144.

It is an arithmetic number, because the mean of its divisors is an integer number (35842144).

Almost surely, 2^71684287 is an apocalyptic number.

71684287 is a deficient number, since it is larger than the sum of its proper divisors (1).

71684287 is an equidigital number, since it uses as much as digits as its factorization.

71684287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 43.

The square root of 71684287 is about 8466.6573687613. The cubic root of 71684287 is about 415.4078093157.

The spelling of 71684287 in words is "seventy-one million, six hundred eighty-four thousand, two hundred eighty-seven".