64244040 has 64 divisors (see below), whose sum is σ = 220268160. Its totient is φ = 14684160.

The previous prime is 64244029. The next prime is 64244053. The reversal of 64244040 is 4044246.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 64244040.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37401 + ... + 39080.

It is an arithmetic number, because the mean of its divisors is an integer number (3441690).

Almost surely, 2^64244040 is an apocalyptic number.

64244040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64244040 is an abundant number, since it is smaller than the sum of its proper divisors (156024120).

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

64244040 is a wasteful number, since it uses less digits than its factorization.

64244040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76502 (or 76498 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 64244040 is about 8015.2379877331. The cubic root of 64244040 is about 400.5077718134.

Adding to 64244040 its reverse (4044246), we get a palindrome (68288286).

The spelling of 64244040 in words is "sixty-four million, two hundred forty-four thousand, forty".