640713324 has 24 divisors (see below), whose sum is σ = 1510412848. Its totient is φ = 211368960.

The previous prime is 640713319. The next prime is 640713331. The reversal of 640713324 is 423317046.

It is a super-2 number, since 2×640713324² = 821027127102257952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640713291 and 640713300.

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 7 ways as a sum of consecutive naturals, for example, 274057 + ... + 276384.

Almost surely, 2^640713324 is an apocalyptic number.

It is an amenable number.

640713324 is an abundant number, since it is smaller than the sum of its proper divisors (869699524).

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

640713324 is a wasteful number, since it uses less digits than its factorization.

640713324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550545 (or 550543 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 640713324 is about 25312.3156585880. The cubic root of 640713324 is about 862.0939258803.

The spelling of 640713324 in words is "six hundred forty million, seven hundred thirteen thousand, three hundred twenty-four".