640113 has 8 divisors (see below), whose sum is σ = 890688. Its totient is φ = 408144.

The previous prime is 640109. The next prime is 640121. The reversal of 640113 is 311046.

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

It is not a de Polignac number, because 640113 - 2² = 640109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640092 and 640101.

It is not an unprimeable number, because it can be changed into a prime (640153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4570 + ... + 4707.

It is an arithmetic number, because the mean of its divisors is an integer number (111336).

2⁶⁴⁰¹¹³ is an apocalyptic number.

It is an amenable number.

640113 is a deficient number, since it is larger than the sum of its proper divisors (250575).

640113 is a wasteful number, since it uses less digits than its factorization.

640113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9303.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 640113 is about 800.0706218828. The cubic root of 640113 is about 86.1824592011.

Adding to 640113 its reverse (311046), we get a palindrome (951159).

The spelling of 640113 in words is "six hundred forty thousand, one hundred thirteen".