642896 has 20 divisors (see below), whose sum is σ = 1300512. Its totient is φ = 307296.

The previous prime is 642881. The next prime is 642899. The reversal of 642896 is 698246.

642896 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 642896.

It is not an unprimeable number, because it can be changed into a prime (642899) by changing a digit.

642896 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, 506 + ... + 1241.

2⁶⁴²⁸⁹⁶ is an apocalyptic number.

It is an amenable number.

642896 is an abundant number, since it is smaller than the sum of its proper divisors (657616).

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

642896 is a wasteful number, since it uses less digits than its factorization.

642896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778 (or 1772 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 642896 is about 801.8079570570. The cubic root of 642896 is about 86.3071762594.

The spelling of 642896 in words is "six hundred forty-two thousand, eight hundred ninety-six".