640018753 has 8 divisors (see below), whose sum is σ = 698407776. Its totient is φ = 581664000.

The previous prime is 640018739. The next prime is 640018759. The reversal of 640018753 is 357810046.

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

It is a cyclic number.

It is not a de Polignac number, because 640018753 - 2⁵ = 640018721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640018759) 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, 45178 + ... + 57628.

It is an arithmetic number, because the mean of its divisors is an integer number (87300972).

Almost surely, 2^640018753 is an apocalyptic number.

It is an amenable number.

640018753 is a deficient number, since it is larger than the sum of its proper divisors (58389023).

640018753 is a wasteful number, since it uses less digits than its factorization.

640018753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17135.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 640018753 is about 25298.5919173380. The cubic root of 640018753 is about 861.7822930376.

Adding to 640018753 its reverse (357810046), we get a palindrome (997828799).

The spelling of 640018753 in words is "six hundred forty million, eighteen thousand, seven hundred fifty-three".