640296 has 24 divisors (see below), whose sum is σ = 1734330. Its totient is φ = 213408.

The previous prime is 640279. The next prime is 640303. The reversal of 640296 is 692046.

It can be written as a sum of positive squares in only one way, i.e., 617796 + 22500 = 786^2 + 150^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640296.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4375 + ... + 4518.

2⁶⁴⁰²⁹⁶ is an apocalyptic number.

It is an amenable number.

640296 is an abundant number, since it is smaller than the sum of its proper divisors (1094034).

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

640296 is a wasteful number, since it uses less digits than its factorization.

640296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8905 (or 8898 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 640296 is about 800.1849786143. The cubic root of 640296 is about 86.1906712342.

The spelling of 640296 in words is "six hundred forty thousand, two hundred ninety-six".