640315 has 8 divisors (see below), whose sum is σ = 827568. Its totient is φ = 472800.

The previous prime is 640307. The next prime is 640333. The reversal of 640315 is 513046.

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

It is not a de Polignac number, because 640315 - 2³ = 640307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640292 and 640301.

It is an unprimeable number.

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, 4861 + ... + 4990.

It is an arithmetic number, because the mean of its divisors is an integer number (103446).

2⁶⁴⁰³¹⁵ is an apocalyptic number.

640315 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

640315 is a deficient number, since it is larger than the sum of its proper divisors (187253).

640315 is a wasteful number, since it uses less digits than its factorization.

640315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9869.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 640315 is about 800.1968507811. The cubic root of 640315 is about 86.1915237600.

The spelling of 640315 in words is "six hundred forty thousand, three hundred fifteen".