642288 has 20 divisors (see below), whose sum is σ = 1659368. Its totient is φ = 214080.

The previous prime is 642281. The next prime is 642359. The reversal of 642288 is 882246.

It is a happy number.

642288 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

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 642288.

It is not an unprimeable number, because it can be changed into a prime (642281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643 + ... + 6738.

2⁶⁴²²⁸⁸ is an apocalyptic number.

It is an amenable number.

642288 is an abundant number, since it is smaller than the sum of its proper divisors (1017080).

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

642288 is a wasteful number, since it uses less digits than its factorization.

642288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13392 (or 13386 counting only the distinct ones).

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

The square root of 642288 is about 801.4287242169. The cubic root of 642288 is about 86.2799601861.

The spelling of 642288 in words is "six hundred forty-two thousand, two hundred eighty-eight".