642258 has 24 divisors (see below), whose sum is σ = 1437696. Its totient is φ = 207000.

The previous prime is 642253. The next prime is 642281. The reversal of 642258 is 852246.

642258 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

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 642258.

It is not an unprimeable number, because it can be changed into a prime (642253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18 + ... + 1133.

It is an arithmetic number, because the mean of its divisors is an integer number (59904).

2⁶⁴²²⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718848).

642258 is an abundant number, since it is smaller than the sum of its proper divisors (795438).

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

642258 is a wasteful number, since it uses less digits than its factorization.

642258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190 (or 1187 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 642258 is about 801.4100074244. The cubic root of 642258 is about 86.2786168432.

It can be divided in two parts, 642 and 258, that added together give a square (900 = 30²).

The spelling of 642258 in words is "six hundred forty-two thousand, two hundred fifty-eight".