64003440 has 40 divisors (see below), whose sum is σ = 198411408. Its totient is φ = 17067520.

The previous prime is 64003399. The next prime is 64003463. The reversal of 64003440 is 4430046.

64003440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133101 + ... + 133580.

Almost surely, 2^64003440 is an apocalyptic number.

64003440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64003440 is an abundant number, since it is smaller than the sum of its proper divisors (134407968).

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

64003440 is a wasteful number, since it uses less digits than its factorization.

64003440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266697 (or 266691 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 64003440 is about 8000.2149971110. The cubic root of 64003440 is about 400.0071665383.

Adding to 64003440 its reverse (4430046), we get a palindrome (68433486).

The spelling of 64003440 in words is "sixty-four million, three thousand, four hundred forty".