65689960 has 64 divisors (see below), whose sum is σ = 169718400. Its totient is φ = 22415616.

The previous prime is 65689937. The next prime is 65689979. The reversal of 65689960 is 6998656.

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, 78826 + ... + 79654.

It is an arithmetic number, because the mean of its divisors is an integer number (2651850).

Almost surely, 2^65689960 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 65689960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84859200).

65689960 is an abundant number, since it is smaller than the sum of its proper divisors (104028440).

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

65689960 is a wasteful number, since it uses less digits than its factorization.

65689960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 65689960 is about 8104.9342995486. The cubic root of 65689960 is about 403.4902075528.

The spelling of 65689960 in words is "sixty-five million, six hundred eighty-nine thousand, nine hundred sixty".