640555062 has 16 divisors (see below), whose sum is σ = 1464125952. Its totient is φ = 183015720.

The previous prime is 640555061. The next prime is 640555067. The reversal of 640555062 is 260555046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640555061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7625614 + ... + 7625697.

It is an arithmetic number, because the mean of its divisors is an integer number (91507872).

Almost surely, 2^640555062 is an apocalyptic number.

640555062 is an abundant number, since it is smaller than the sum of its proper divisors (823570890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640555062 is a wasteful number, since it uses less digits than its factorization.

640555062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15251323.

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 640555062 is about 25309.1892797853. The cubic root of 640555062 is about 862.0229383631.

The spelling of 640555062 in words is "six hundred forty million, five hundred fifty-five thousand, sixty-two".