640324153 has 4 divisors (see below), whose sum is σ = 731799040. Its totient is φ = 548849268.

The previous prime is 640324141. The next prime is 640324177. The reversal of 640324153 is 351423046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640324153 - 2⁵ = 640324121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640324123) 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 3 ways as a sum of consecutive naturals, for example, 45737433 + ... + 45737446.

It is an arithmetic number, because the mean of its divisors is an integer number (182949760).

Almost surely, 2^640324153 is an apocalyptic number.

It is an amenable number.

640324153 is a deficient number, since it is larger than the sum of its proper divisors (91474887).

640324153 is an equidigital number, since it uses as much as digits as its factorization.

640324153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91474886.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 640324153 is about 25304.6271065195. The cubic root of 640324153 is about 861.9193444703.

Adding to 640324153 its reverse (351423046), we get a palindrome (991747199).

The spelling of 640324153 in words is "six hundred forty million, three hundred twenty-four thousand, one hundred fifty-three".