640102 has 8 divisors (see below), whose sum is σ = 964512. Its totient is φ = 318600.

The previous prime is 640099. The next prime is 640109. The reversal of 640102 is 201046.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49 + ... + 1132.

It is an arithmetic number, because the mean of its divisors is an integer number (120564).

2⁶⁴⁰¹⁰² is an apocalyptic number.

640102 is a deficient number, since it is larger than the sum of its proper divisors (324410).

640102 is a wasteful number, since it uses less digits than its factorization.

640102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 640102 is about 800.0637474602. The cubic root of 640102 is about 86.1819655318.

Adding to 640102 its reverse (201046), we get a palindrome (841148).

The spelling of 640102 in words is "six hundred forty thousand, one hundred two".