64245440 has 224 divisors, whose sum is σ = 193121280. Its totient is φ = 19869696.

The previous prime is 64245437. The next prime is 64245457. The reversal of 64245440 is 4454246.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 1494059 + ... + 1494101.

Almost surely, 2^64245440 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 64245440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96560640).

64245440 is an abundant number, since it is smaller than the sum of its proper divisors (128875840).

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

64245440 is a wasteful number, since it uses less digits than its factorization.

64245440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 64245440 is about 8015.3253209087. The cubic root of 64245440 is about 400.5106810680.

Adding to 64245440 its reverse (4454246), we get a palindrome (68699686).

The spelling of 64245440 in words is "sixty-four million, two hundred forty-five thousand, four hundred forty".