640250326 has 4 divisors (see below), whose sum is σ = 960375492. Its totient is φ = 320125162.

The previous prime is 640250323. The next prime is 640250329. The reversal of 640250326 is 623052046.

It is a happy number.

640250326 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (640250323) and next prime (640250329).

It is a junction number, because it is equal to n+sod(n) for n = 640250294 and 640250303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640250323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160062580 + ... + 160062583.

It is an arithmetic number, because the mean of its divisors is an integer number (240093873).

Almost surely, 2^640250326 is an apocalyptic number.

640250326 is a deficient number, since it is larger than the sum of its proper divisors (320125166).

640250326 is a wasteful number, since it uses less digits than its factorization.

640250326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320125165.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 640250326 is about 25303.1682996418. The cubic root of 640250326 is about 861.8862178292.

The spelling of 640250326 in words is "six hundred forty million, two hundred fifty thousand, three hundred twenty-six".