64244240 has 20 divisors (see below), whose sum is σ = 149368044. Its totient is φ = 25697664.

The previous prime is 64244237. The next prime is 64244249. The reversal of 64244240 is 4244246.

It can be written as a sum of positive squares in 2 ways, for example, as 11478544 + 52765696 = 3388^2 + 7264^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (64244249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401447 + ... + 401606.

Almost surely, 2^64244240 is an apocalyptic number.

It is an amenable number.

64244240 is an abundant number, since it is smaller than the sum of its proper divisors (85123804).

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

64244240 is a wasteful number, since it uses less digits than its factorization.

64244240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803066 (or 803060 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 64244240 is about 8015.2504639593. The cubic root of 64244240 is about 400.5081874238.

Adding to 64244240 its reverse (4244246), we get a palindrome (68488486).

The spelling of 64244240 in words is "sixty-four million, two hundred forty-four thousand, two hundred forty".