640550240 has 48 divisors (see below), whose sum is σ = 1650877200. Its totient is φ = 232926720.

The previous prime is 640550233. The next prime is 640550269. The reversal of 640550240 is 42055046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180215 + ... + 183734.

It is an arithmetic number, because the mean of its divisors is an integer number (34393275).

Almost surely, 2^640550240 is an apocalyptic number.

It is an amenable number.

640550240 is an abundant number, since it is smaller than the sum of its proper divisors (1010326960).

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

640550240 is a wasteful number, since it uses less digits than its factorization.

640550240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363975 (or 363967 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 640550240 is about 25309.0940177637. The cubic root of 640550240 is about 862.0207752990.

The spelling of 640550240 in words is "six hundred forty million, five hundred fifty thousand, two hundred forty".