64244220 has 48 divisors (see below), whose sum is σ = 181321728. Its totient is φ = 16994880.

The previous prime is 64244197. The next prime is 64244233. The reversal of 64244220 is 2244246.

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, 3405 + ... + 11835.

It is an arithmetic number, because the mean of its divisors is an integer number (3777536).

Almost surely, 2^64244220 is an apocalyptic number.

64244220 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 64244220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90660864).

64244220 is an abundant number, since it is smaller than the sum of its proper divisors (117077508).

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

64244220 is a wasteful number, since it uses less digits than its factorization.

64244220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8570 (or 8568 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 64244220 is about 8015.2492163376. The cubic root of 64244220 is about 400.5081458628.

Adding to 64244220 its reverse (2244246), we get a palindrome (66488466).

The spelling of 64244220 in words is "sixty-four million, two hundred forty-four thousand, two hundred twenty".