640296213 has 8 divisors (see below), whose sum is σ = 865423488. Its totient is φ = 421016544.

The previous prime is 640296197. The next prime is 640296253. The reversal of 640296213 is 312692046.

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

It is not a de Polignac number, because 640296213 - 2⁴ = 640296197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640296253) 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, 1461645 + ... + 1462082.

It is an arithmetic number, because the mean of its divisors is an integer number (108177936).

Almost surely, 2^640296213 is an apocalyptic number.

It is an amenable number.

640296213 is a deficient number, since it is larger than the sum of its proper divisors (225127275).

640296213 is a wasteful number, since it uses less digits than its factorization.

640296213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923803.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 640296213 is about 25304.0750275524. The cubic root of 640296213 is about 861.9068079154.

The spelling of 640296213 in words is "six hundred forty million, two hundred ninety-six thousand, two hundred thirteen".