640250327 has 4 divisors (see below), whose sum is σ = 650746296. Its totient is φ = 629754360.

The previous prime is 640250323. The next prime is 640250329. The reversal of 640250327 is 723052046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 723052046 = 2 ⋅361526023.

It is a cyclic number.

It is not a de Polignac number, because 640250327 - 2² = 640250323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640250327.

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 in 3 ways as a sum of consecutive naturals, for example, 5247893 + ... + 5248014.

It is an arithmetic number, because the mean of its divisors is an integer number (162686574).

Almost surely, 2^640250327 is an apocalyptic number.

640250327 is a deficient number, since it is larger than the sum of its proper divisors (10495969).

640250327 is a wasteful number, since it uses less digits than its factorization.

640250327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10495968.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 640250327 is about 25303.1683194022. The cubic root of 640250327 is about 861.8862182780.

The spelling of 640250327 in words is "six hundred forty million, two hundred fifty thousand, three hundred twenty-seven".