640043424 has 192 divisors, whose sum is σ = 1986969600. Its totient is φ = 199874304.

The previous prime is 640043419. The next prime is 640043441. The reversal of 640043424 is 424340046.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 2084679 + ... + 2084985.

It is an arithmetic number, because the mean of its divisors is an integer number (10348800).

Almost surely, 2^640043424 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 640043424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993484800).

640043424 is an abundant number, since it is smaller than the sum of its proper divisors (1346926176).

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

640043424 is a wasteful number, since it uses less digits than its factorization.

640043424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 640043424 is about 25299.0795089466. The cubic root of 640043424 is about 861.7933660245.

The spelling of 640043424 in words is "six hundred forty million, forty-three thousand, four hundred twenty-four".