640560067 has 8 divisors (see below), whose sum is σ = 745881696. Its totient is φ = 538691712.

The previous prime is 640560061. The next prime is 640560113. The reversal of 640560067 is 760065046.

640560067 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 640560067 - 2³ = 640560059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640560061) 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, 862918 + ... + 863659.

It is an arithmetic number, because the mean of its divisors is an integer number (93235212).

Almost surely, 2^640560067 is an apocalyptic number.

640560067 is a deficient number, since it is larger than the sum of its proper divisors (105321629).

640560067 is a wasteful number, since it uses less digits than its factorization.

640560067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726637.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 640560067 is about 25309.2881567222. The cubic root of 640560067 is about 862.0251835064.

The spelling of 640560067 in words is "six hundred forty million, five hundred sixty thousand, sixty-seven".