65444220 has 96 divisors (see below), whose sum is σ = 215611200. Its totient is φ = 16422912.

The previous prime is 65444201. The next prime is 65444233. The reversal of 65444220 is 2244456.

65444220 is a `hidden beast` number, since 654 + 4 + 4 + 2 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5616 + ... + 12744.

It is an arithmetic number, because the mean of its divisors is an integer number (2245950).

Almost surely, 2^65444220 is an apocalyptic number.

65444220 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 65444220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107805600).

65444220 is an abundant number, since it is smaller than the sum of its proper divisors (150166980).

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

65444220 is a wasteful number, since it uses less digits than its factorization.

65444220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164 (or 7156 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 65444220 is about 8089.7601942208. The cubic root of 65444220 is about 402.9864391293.

Adding to 65444220 its reverse (2244456), we get a palindrome (67688676).

The spelling of 65444220 in words is "sixty-five million, four hundred forty-four thousand, two hundred twenty".