640048 has 20 divisors (see below), whose sum is σ = 1254880. Its totient is φ = 316224.

The previous prime is 640043. The next prime is 640049. The reversal of 640048 is 840046.

It is a super-2 number, since 2×640048² = 819322884608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561 + ... + 1927.

It is an arithmetic number, because the mean of its divisors is an integer number (62744).

2⁶⁴⁰⁰⁴⁸ is an apocalyptic number.

It is an amenable number.

640048 is a deficient number, since it is larger than the sum of its proper divisors (614832).

640048 is a wasteful number, since it uses less digits than its factorization.

640048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 640048 is about 800.0299994375. The cubic root of 640048 is about 86.1795419821.

The spelling of 640048 in words is "six hundred forty thousand, forty-eight".