640223027 has 8 divisors (see below), whose sum is σ = 643400496. Its totient is φ = 637053472.

The previous prime is 640223021. The next prime is 640223029. The reversal of 640223027 is 720322046.

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 640223027 - 2¹⁴ = 640206643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640222987 and 640223005.

It is not an unprimeable number, because it can be changed into a prime (640223021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215033 + ... + 217989.

It is an arithmetic number, because the mean of its divisors is an integer number (80425062).

Almost surely, 2^640223027 is an apocalyptic number.

640223027 is a deficient number, since it is larger than the sum of its proper divisors (3177469).

640223027 is a wasteful number, since it uses less digits than its factorization.

640223027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3957.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 640223027 is about 25302.6288555162. The cubic root of 640223027 is about 861.8739679507.

The spelling of 640223027 in words is "six hundred forty million, two hundred twenty-three thousand, twenty-seven".