640304026 has 8 divisors (see below), whose sum is σ = 961750944. Its totient is φ = 319720380.

The previous prime is 640304023. The next prime is 640304029. The reversal of 640304026 is 620403046.

It is an interprime number because it is at equal distance from previous prime (640304023) and next prime (640304029).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (640304023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213960 + ... + 216931.

It is an arithmetic number, because the mean of its divisors is an integer number (120218868).

Almost surely, 2^640304026 is an apocalyptic number.

640304026 is a deficient number, since it is larger than the sum of its proper divisors (321446918).

640304026 is a wasteful number, since it uses less digits than its factorization.

640304026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431636.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 640304026 is about 25304.2294093300. The cubic root of 640304026 is about 861.9103136108.

The spelling of 640304026 in words is "six hundred forty million, three hundred four thousand, twenty-six".