65989616 has 80 divisors (see below), whose sum is σ = 164989440. Its totient is φ = 24810240.

The previous prime is 65989589. The next prime is 65989643. The reversal of 65989616 is 61698956.

It is an interprime number because it is at equal distance from previous prime (65989589) and next prime (65989643).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34805 + ... + 36651.

It is an arithmetic number, because the mean of its divisors is an integer number (2062368).

Almost surely, 2^65989616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65989616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82494720).

65989616 is an abundant number, since it is smaller than the sum of its proper divisors (98999824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65989616 is a wasteful number, since it uses less digits than its factorization.

65989616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902 (or 1896 counting only the distinct ones).

The product of its digits is 699840, while the sum is 50.

The square root of 65989616 is about 8123.3992884752. The cubic root of 65989616 is about 404.1028068918.

The spelling of 65989616 in words is "sixty-five million, nine hundred eighty-nine thousand, six hundred sixteen".