640321519 has 8 divisors (see below), whose sum is σ = 658180368. Its totient is φ = 622491840.

The previous prime is 640321499. The next prime is 640321573. The reversal of 640321519 is 915123046.

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 640321519 - 2¹⁵ = 640288751 is a prime.

It is a super-2 number, since 2×640321519² = 820023295388934722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640321589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41739 + ... + 54979.

It is an arithmetic number, because the mean of its divisors is an integer number (82272546).

Almost surely, 2^640321519 is an apocalyptic number.

640321519 is a deficient number, since it is larger than the sum of its proper divisors (17858849).

640321519 is a wasteful number, since it uses less digits than its factorization.

640321519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14585.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 640321519 is about 25304.5750606486. The cubic root of 640321519 is about 861.9181626217.

The spelling of 640321519 in words is "six hundred forty million, three hundred twenty-one thousand, five hundred nineteen".