640250606 has 8 divisors (see below), whose sum is σ = 963406440. Its totient is φ = 319115128.

The previous prime is 640250551. The next prime is 640250641. The reversal of 640250606 is 606052046.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504296 + ... + 505563.

It is an arithmetic number, because the mean of its divisors is an integer number (120425805).

Almost surely, 2^640250606 is an apocalyptic number.

640250606 is a deficient number, since it is larger than the sum of its proper divisors (323155834).

640250606 is a wasteful number, since it uses less digits than its factorization.

640250606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010178.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 640250606 is about 25303.1738325452. The cubic root of 640250606 is about 861.8863434718.

The spelling of 640250606 in words is "six hundred forty million, two hundred fifty thousand, six hundred six".