640336424 has 32 divisors (see below), whose sum is σ = 1477701120. Its totient is φ = 253319616.

The previous prime is 640336397. The next prime is 640336427. The reversal of 640336424 is 424633046.

It is a super-2 number, since 2×640336424² = 820061471802215552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640336427) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 439064 + ... + 440519.

It is an arithmetic number, because the mean of its divisors is an integer number (46178160).

Almost surely, 2^640336424 is an apocalyptic number.

It is an amenable number.

640336424 is an abundant number, since it is smaller than the sum of its proper divisors (837364696).

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

640336424 is a wasteful number, since it uses less digits than its factorization.

640336424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879609 (or 879605 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 32.

The square root of 640336424 is about 25304.8695708948. The cubic root of 640336424 is about 861.9248502987.

The spelling of 640336424 in words is "six hundred forty million, three hundred thirty-six thousand, four hundred twenty-four".