640253383 has 8 divisors (see below), whose sum is σ = 798238080. Its totient is φ = 498898680.

The previous prime is 640253357. The next prime is 640253389. The reversal of 640253383 is 383352046.

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

It is not a de Polignac number, because 640253383 - 2⁵ = 640253351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640253389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4157413 + ... + 4157566.

It is an arithmetic number, because the mean of its divisors is an integer number (99779760).

Almost surely, 2^640253383 is an apocalyptic number.

640253383 is a deficient number, since it is larger than the sum of its proper divisors (157984697).

640253383 is a wasteful number, since it uses less digits than its factorization.

640253383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8314997.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 640253383 is about 25303.2287070247. The cubic root of 640253383 is about 861.8875895750.

The spelling of 640253383 in words is "six hundred forty million, two hundred fifty-three thousand, three hundred eighty-three".