64344220 has 48 divisors (see below), whose sum is σ = 141926400. Its totient is φ = 24471360.

The previous prime is 64344151. The next prime is 64344307. The reversal of 64344220 is 2244346.

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, 35701 + ... + 37459.

It is an arithmetic number, because the mean of its divisors is an integer number (2956800).

Almost surely, 2^64344220 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 64344220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70963200).

64344220 is an abundant number, since it is smaller than the sum of its proper divisors (77582180).

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

64344220 is a wasteful number, since it uses less digits than its factorization.

64344220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858 (or 1856 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 64344220 is about 8021.4848999422. The cubic root of 64344220 is about 400.7158431572.

Adding to 64344220 its reverse (2244346), we get a palindrome (66588566).

The spelling of 64344220 in words is "sixty-four million, three hundred forty-four thousand, two hundred twenty".