640250367 has 4 divisors (see below), whose sum is σ = 853667160. Its totient is φ = 426833576.

The previous prime is 640250357. The next prime is 640250407. The reversal of 640250367 is 763052046.

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

It is a cyclic number.

It is not a de Polignac number, because 640250367 - 2¹⁰ = 640249343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640250357) 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, 106708392 + ... + 106708397.

It is an arithmetic number, because the mean of its divisors is an integer number (213416790).

Almost surely, 2^640250367 is an apocalyptic number.

640250367 is a deficient number, since it is larger than the sum of its proper divisors (213416793).

640250367 is a wasteful number, since it uses less digits than its factorization.

640250367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213416792.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 640250367 is about 25303.1691098171. The cubic root of 640250367 is about 861.8862362269.

The spelling of 640250367 in words is "six hundred forty million, two hundred fifty thousand, three hundred sixty-seven".