640335652 has 24 divisors (see below), whose sum is σ = 1239682752. Its totient is φ = 286960800.

The previous prime is 640335649. The next prime is 640335667. The reversal of 640335652 is 256533046.

640335652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99363 + ... + 105610.

It is an arithmetic number, because the mean of its divisors is an integer number (51653448).

Almost surely, 2^640335652 is an apocalyptic number.

It is an amenable number.

640335652 is a deficient number, since it is larger than the sum of its proper divisors (599347100).

640335652 is a wasteful number, since it uses less digits than its factorization.

640335652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205059 (or 205057 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 34.

The square root of 640335652 is about 25304.8543169092. The cubic root of 640335652 is about 861.9245039150.

Adding to 640335652 its reverse (256533046), we get a palindrome (896868698).

The spelling of 640335652 in words is "six hundred forty million, three hundred thirty-five thousand, six hundred fifty-two".