640027567 has 4 divisors (see below), whose sum is σ = 643603320. Its totient is φ = 636451816.

The previous prime is 640027547. The next prime is 640027627. The reversal of 640027567 is 765720046.

640027567 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640027567 - 2²⁷ = 505809839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640027537) 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, 1787608 + ... + 1787965.

It is an arithmetic number, because the mean of its divisors is an integer number (160900830).

Almost surely, 2^640027567 is an apocalyptic number.

640027567 is a deficient number, since it is larger than the sum of its proper divisors (3575753).

640027567 is a wasteful number, since it uses less digits than its factorization.

640027567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575752.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 640027567 is about 25298.7661161567. The cubic root of 640027567 is about 861.7862490228.

The spelling of 640027567 in words is "six hundred forty million, twenty-seven thousand, five hundred sixty-seven".