640848 has 60 divisors (see below), whose sum is σ = 1815360. Its totient is φ = 194688.

The previous prime is 640847. The next prime is 640853. The reversal of 640848 is 848046.

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 640848.

It is not an unprimeable number, because it can be changed into a prime (640847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8073 + ... + 8151.

It is an arithmetic number, because the mean of its divisors is an integer number (30256).

2⁶⁴⁰⁸⁴⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907680).

640848 is an abundant number, since it is smaller than the sum of its proper divisors (1174512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640848 is a wasteful number, since it uses less digits than its factorization.

640848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 640848 is about 800.5298245537. The cubic root of 640848 is about 86.2154324826.

The spelling of 640848 in words is "six hundred forty thousand, eight hundred forty-eight".