64344040 has 32 divisors (see below), whose sum is σ = 149769000. Its totient is φ = 24849664.

The previous prime is 64344037. The next prime is 64344061. The reversal of 64344040 is 4044346.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 29746116 + 34597924 = 5454^2 + 5882^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64343996 and 64344014.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26575 + ... + 28894.

Almost surely, 2^64344040 is an apocalyptic number.

It is an amenable number.

64344040 is an abundant number, since it is smaller than the sum of its proper divisors (85424960).

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

64344040 is a wasteful number, since it uses less digits than its factorization.

64344040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55509 (or 55505 counting only the distinct ones).

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

The square root of 64344040 is about 8021.4736800665. The cubic root of 64344040 is about 400.7154694955.

Adding to 64344040 its reverse (4044346), we get a palindrome (68388386).

The spelling of 64344040 in words is "sixty-four million, three hundred forty-four thousand, forty".