71816623 has 2 divisors, whose sum is σ = 71816624. Its totient is φ = 71816622.

The previous prime is 71816617. The next prime is 71816639. The reversal of 71816623 is 32661817.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71816623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71816683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35908311 + 35908312.

It is an arithmetic number, because the mean of its divisors is an integer number (35908312).

Almost surely, 2^71816623 is an apocalyptic number.

71816623 is a deficient number, since it is larger than the sum of its proper divisors (1).

71816623 is an equidigital number, since it uses as much as digits as its factorization.

71816623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 71816623 is about 8474.4688919129. The cubic root of 71816623 is about 415.6632795919.

The spelling of 71816623 in words is "seventy-one million, eight hundred sixteen thousand, six hundred twenty-three".