640328044527616 has 405 divisors, whose sum is σ = 1412428042231297. Its totient is φ = 290214589235200.

The previous prime is 640328044527601. The next prime is 640328044527631. The reversal of 640328044527616 is 616725440823046.

The square root of 640328044527616 is 25304704.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (640328044527601) and next prime (640328044527631).

It can be written as a sum of positive squares in 13 ways, for example, as 30470400000000 + 609857644527616 = 5520000^2 + 24695296^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1596828041016 + ... + 1596828041416.

Almost surely, 2^{640328044527616} is an apocalyptic number.

640328044527616 is the 25304704-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640328044527616

640328044527616 is an abundant number, since it is smaller than the sum of its proper divisors (772099997703681).

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

640328044527616 is an frugal number, since it uses more digits than its factorization.

640328044527616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 58.

The spelling of 640328044527616 in words is "six hundred forty trillion, three hundred twenty-eight billion, forty-four million, five hundred twenty-seven thousand, six hundred sixteen".