65984220 has 72 divisors (see below), whose sum is σ = 207580464. Its totient is φ = 17594496.

The previous prime is 65984183. The next prime is 65984227. The reversal of 65984220 is 2248956.

It is a happy number.

65984220 is a `hidden beast` number, since 6 + 598 + 42 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65984227) 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, 1929 + ... + 11648.

It is an arithmetic number, because the mean of its divisors is an integer number (2883062).

Almost surely, 2^65984220 is an apocalyptic number.

65984220 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 65984220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103790232).

65984220 is an abundant number, since it is smaller than the sum of its proper divisors (141596244).

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

65984220 is a wasteful number, since it uses less digits than its factorization.

65984220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13601 (or 13587 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 65984220 is about 8123.0671547144. The cubic root of 65984220 is about 404.0917920367.

The spelling of 65984220 in words is "sixty-five million, nine hundred eighty-four thousand, two hundred twenty".