640848453 has 8 divisors (see below), whose sum is σ = 976531008. Its totient is φ = 366199104.

The previous prime is 640848449. The next prime is 640848469. The reversal of 640848453 is 354848046.

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

It is not a de Polignac number, because 640848453 - 2² = 640848449 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640848413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15258276 + ... + 15258317.

It is an arithmetic number, because the mean of its divisors is an integer number (122066376).

Almost surely, 2^640848453 is an apocalyptic number.

It is an amenable number.

640848453 is a deficient number, since it is larger than the sum of its proper divisors (335682555).

640848453 is a wasteful number, since it uses less digits than its factorization.

640848453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30516603.

The product of its (nonzero) digits is 368640, while the sum is 42.

The square root of 640848453 is about 25314.9847521187. The cubic root of 640848453 is about 862.1545279712.

The spelling of 640848453 in words is "six hundred forty million, eight hundred forty-eight thousand, four hundred fifty-three".