640076 has 6 divisors (see below), whose sum is σ = 1120140. Its totient is φ = 320036.

The previous prime is 640069. The next prime is 640099. The reversal of 640076 is 670046.

It is an Ulam number.

It is an unprimeable number.

640076 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 as a sum of consecutive naturals, namely, 80006 + ... + 80013.

It is an arithmetic number, because the mean of its divisors is an integer number (186690).

2⁶⁴⁰⁰⁷⁶ is an apocalyptic number.

It is an amenable number.

640076 is a deficient number, since it is larger than the sum of its proper divisors (480064).

640076 is a wasteful number, since it uses less digits than its factorization.

640076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160023 (or 160021 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 640076 is about 800.0474985899. The cubic root of 640076 is about 86.1807986545.

The spelling of 640076 in words is "six hundred forty thousand, seventy-six".