642602 has 4 divisors (see below), whose sum is σ = 963906. Its totient is φ = 321300.

The previous prime is 642581. The next prime is 642613. The reversal of 642602 is 206246.

642602 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 206246 = 2 ⋅103123.

It can be written as a sum of positive squares in only one way, i.e., 534361 + 108241 = 731^2 + 329^2 .

It is an Ulam number.

It is an unprimeable number.

642602 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, 160649 + ... + 160652.

2⁶⁴²⁶⁰² is an apocalyptic number.

642602 is a deficient number, since it is larger than the sum of its proper divisors (321304).

642602 is a wasteful number, since it uses less digits than its factorization.

642602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321303.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 642602 is about 801.6246004209. The cubic root of 642602 is about 86.2940179991.

Adding to 642602 its reverse (206246), we get a palindrome (848848).

The spelling of 642602 in words is "six hundred forty-two thousand, six hundred two".