640462255 has 16 divisors (see below), whose sum is σ = 803033280. Its totient is φ = 489443328.

The previous prime is 640462223. The next prime is 640462283. The reversal of 640462255 is 552264046.

It is a cyclic number.

It is not a de Polignac number, because 640462255 - 2⁵ = 640462223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640462255.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94831 + ... + 101359.

It is an arithmetic number, because the mean of its divisors is an integer number (50189580).

Almost surely, 2^640462255 is an apocalyptic number.

640462255 is a deficient number, since it is larger than the sum of its proper divisors (162571025).

640462255 is a wasteful number, since it uses less digits than its factorization.

640462255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7410.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 640462255 is about 25307.3557488727. The cubic root of 640462255 is about 861.9813048739.

The spelling of 640462255 in words is "six hundred forty million, four hundred sixty-two thousand, two hundred fifty-five".