71617989 has 24 divisors (see below), whose sum is σ = 99452448. Its totient is φ = 45834400.

The previous prime is 71617981. The next prime is 71618009. The reversal of 71617989 is 98971617.

It is a happy number.

It is not a de Polignac number, because 71617989 - 2³ = 71617981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71617981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 669274 + ... + 669380.

It is an arithmetic number, because the mean of its divisors is an integer number (4143852).

Almost surely, 2^71617989 is an apocalyptic number.

It is an amenable number.

71617989 is a deficient number, since it is larger than the sum of its proper divisors (27834459).

71617989 is a wasteful number, since it uses less digits than its factorization.

71617989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 258 counting only the distinct ones).

The product of its digits is 190512, while the sum is 48.

The square root of 71617989 is about 8462.7412225590. The cubic root of 71617989 is about 415.2797049900.

The spelling of 71617989 in words is "seventy-one million, six hundred seventeen thousand, nine hundred eighty-nine".