640062266 has 16 divisors (see below), whose sum is σ = 973305600. Its totient is φ = 315636048.

The previous prime is 640062263. The next prime is 640062289. The reversal of 640062266 is 662260046.

It is not an unprimeable number, because it can be changed into a prime (640062263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204320 + ... + 207428.

It is an arithmetic number, because the mean of its divisors is an integer number (60831600).

Almost surely, 2^640062266 is an apocalyptic number.

640062266 is a deficient number, since it is larger than the sum of its proper divisors (333243334).

640062266 is a wasteful number, since it uses less digits than its factorization.

640062266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 640062266 is about 25299.4518912960. The cubic root of 640062266 is about 861.8018226128.

The spelling of 640062266 in words is "six hundred forty million, sixty-two thousand, two hundred sixty-six".