640148 has 12 divisors (see below), whose sum is σ = 1179360. Its totient is φ = 303192.

The previous prime is 640139. The next prime is 640151. The reversal of 640148 is 841046.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640148.

It is an unprimeable number.

640148 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4136 + ... + 4287.

It is an arithmetic number, because the mean of its divisors is an integer number (98280).

2⁶⁴⁰¹⁴⁸ is an apocalyptic number.

It is an amenable number.

640148 is a deficient number, since it is larger than the sum of its proper divisors (539212).

640148 is a wasteful number, since it uses less digits than its factorization.

640148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8446 (or 8444 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 640148 is about 800.0924946530. The cubic root of 640148 is about 86.1840299296.

The spelling of 640148 in words is "six hundred forty thousand, one hundred forty-eight".