640215262 has 8 divisors (see below), whose sum is σ = 961420536. Its totient is φ = 319741752.

The previous prime is 640215259. The next prime is 640215269. The reversal of 640215262 is 262512046.

640215262 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 640215262.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640215269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180748 + ... + 184255.

It is an arithmetic number, because the mean of its divisors is an integer number (120177567).

Almost surely, 2^640215262 is an apocalyptic number.

640215262 is a deficient number, since it is larger than the sum of its proper divisors (321205274).

640215262 is a wasteful number, since it uses less digits than its factorization.

640215262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365882.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 640215262 is about 25302.4754124967. The cubic root of 640215262 is about 861.8704834991.

The spelling of 640215262 in words is "six hundred forty million, two hundred fifteen thousand, two hundred sixty-two".