640210622 has 4 divisors (see below), whose sum is σ = 960315936. Its totient is φ = 320105310.

The previous prime is 640210609. The next prime is 640210663. The reversal of 640210622 is 226012046.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160052654 + ... + 160052657.

It is an arithmetic number, because the mean of its divisors is an integer number (240078984).

Almost surely, 2^640210622 is an apocalyptic number.

640210622 is a deficient number, since it is larger than the sum of its proper divisors (320105314).

640210622 is a wasteful number, since it uses less digits than its factorization.

640210622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320105313.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 640210622 is about 25302.3837216971. The cubic root of 640210622 is about 861.8684013407.

Adding to 640210622 its reverse (226012046), we get a palindrome (866222668).

The spelling of 640210622 in words is "six hundred forty million, two hundred ten thousand, six hundred twenty-two".