640033365 has 8 divisors (see below), whose sum is σ = 1024053408. Its totient is φ = 341351120.

The previous prime is 640033349. The next prime is 640033367. The reversal of 640033365 is 563330046.

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

It is not a de Polignac number, because 640033365 - 2⁴ = 640033349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640033367) 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, 21334431 + ... + 21334460.

It is an arithmetic number, because the mean of its divisors is an integer number (128006676).

Almost surely, 2^640033365 is an apocalyptic number.

It is an amenable number.

640033365 is a deficient number, since it is larger than the sum of its proper divisors (384020043).

640033365 is a wasteful number, since it uses less digits than its factorization.

640033365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42668899.

The product of its (nonzero) digits is 19440, while the sum is 30.

The square root of 640033365 is about 25298.8807064660. The cubic root of 640033365 is about 861.7888513178.

The spelling of 640033365 in words is "six hundred forty million, thirty-three thousand, three hundred sixty-five".