640450113 has 4 divisors (see below), whose sum is σ = 853933488. Its totient is φ = 426966740.

The previous prime is 640450103. The next prime is 640450147. The reversal of 640450113 is 311054046.

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 640450113 - 2²⁰ = 639401537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (640450103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106741683 + ... + 106741688.

It is an arithmetic number, because the mean of its divisors is an integer number (213483372).

Almost surely, 2^640450113 is an apocalyptic number.

It is an amenable number.

640450113 is a deficient number, since it is larger than the sum of its proper divisors (213483375).

640450113 is a wasteful number, since it uses less digits than its factorization.

640450113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213483374.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 640450113 is about 25307.1158570075. The cubic root of 640450113 is about 861.9758576400.

The spelling of 640450113 in words is "six hundred forty million, four hundred fifty thousand, one hundred thirteen".