71889609 has 12 divisors (see below), whose sum is σ = 105359408. Its totient is φ = 43569240.

The previous prime is 71889581. The next prime is 71889613. The reversal of 71889609 is 90698817.

It is a happy number.

It is not a de Polignac number, because 71889609 - 2⁸ = 71889353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71889619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98659 + ... + 99384.

Almost surely, 2^71889609 is an apocalyptic number.

It is an amenable number.

71889609 is a deficient number, since it is larger than the sum of its proper divisors (33469799).

71889609 is a wasteful number, since it uses less digits than its factorization.

71889609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198068 (or 198057 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 71889609 is about 8478.7740269452. The cubic root of 71889609 is about 415.8040424007.

The spelling of 71889609 in words is "seventy-one million, eight hundred eighty-nine thousand, six hundred nine".