640223619 has 8 divisors (see below), whose sum is σ = 975578880. Its totient is φ = 365842056.

The previous prime is 640223579. The next prime is 640223629. The reversal of 640223619 is 916322046.

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

It is not a de Polignac number, because 640223619 - 2⁷ = 640223491 is a prime.

It is a super-2 number, since 2×640223619² = 819772564650914322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640223619.

It is not an unprimeable number, because it can be changed into a prime (640223629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15243399 + ... + 15243440.

It is an arithmetic number, because the mean of its divisors is an integer number (121947360).

Almost surely, 2^640223619 is an apocalyptic number.

640223619 is a deficient number, since it is larger than the sum of its proper divisors (335355261).

640223619 is a wasteful number, since it uses less digits than its factorization.

640223619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30486849.

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

The square root of 640223619 is about 25302.6405539027. The cubic root of 640223619 is about 861.8742336025.

The spelling of 640223619 in words is "six hundred forty million, two hundred twenty-three thousand, six hundred nineteen".