640308496 has 20 divisors (see below), whose sum is σ = 1247457484. Its totient is φ = 318384000.

The previous prime is 640308467. The next prime is 640308497. The reversal of 640308496 is 694803046.

It can be written as a sum of positive squares in 2 ways, for example, as 22090000 + 618218496 = 4700^2 + 24864^2 .

It is not an unprimeable number, because it can be changed into a prime (640308497) 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 3 ways as a sum of consecutive naturals, for example, 107655 + ... + 113446.

Almost surely, 2^640308496 is an apocalyptic number.

It is an amenable number.

640308496 is a deficient number, since it is larger than the sum of its proper divisors (607148988).

640308496 is a wasteful number, since it uses less digits than its factorization.

640308496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221290 (or 221284 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 640308496 is about 25304.3177343314. The cubic root of 640308496 is about 861.9123192883.

It can be divided in two parts, 640 and 308496, that added together give a square (309136 = 556²).

The spelling of 640308496 in words is "six hundred forty million, three hundred eight thousand, four hundred ninety-six".