65998560 has 96 divisors (see below), whose sum is σ = 209018880. Its totient is φ = 17504768.

The previous prime is 65998531. The next prime is 65998579. The reversal of 65998560 is 6589956.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 172129 + ... + 172511.

It is an arithmetic number, because the mean of its divisors is an integer number (2177280).

Almost surely, 2^65998560 is an apocalyptic number.

65998560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65998560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104509440).

65998560 is an abundant number, since it is smaller than the sum of its proper divisors (143020320).

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

65998560 is a wasteful number, since it uses less digits than its factorization.

65998560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 48.

The square root of 65998560 is about 8123.9497782790. The cubic root of 65998560 is about 404.1210629572.

The spelling of 65998560 in words is "sixty-five million, nine hundred ninety-eight thousand, five hundred sixty".