64344280 has 128 divisors (see below), whose sum is σ = 194503680. Its totient is φ = 18501120.

The previous prime is 64344151. The next prime is 64344307. The reversal of 64344280 is 8244346.

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, 39237 + ... + 40843.

It is an arithmetic number, because the mean of its divisors is an integer number (1519560).

Almost surely, 2^64344280 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 64344280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97251840).

64344280 is an abundant number, since it is smaller than the sum of its proper divisors (130159400).

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

64344280 is a wasteful number, since it uses less digits than its factorization.

64344280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 64344280 is about 8021.4886398972. The cubic root of 64344280 is about 400.7159677110.

The spelling of 64344280 in words is "sixty-four million, three hundred forty-four thousand, two hundred eighty".