642713 has 4 divisors (see below), whose sum is σ = 676560. Its totient is φ = 608868.

The previous prime is 642701. The next prime is 642737. The reversal of 642713 is 317246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642713 - 2⁸ = 642457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16895 + ... + 16932.

It is an arithmetic number, because the mean of its divisors is an integer number (169140).

2⁶⁴²⁷¹³ is an apocalyptic number.

It is an amenable number.

642713 is a deficient number, since it is larger than the sum of its proper divisors (33847).

642713 is a wasteful number, since it uses less digits than its factorization.

642713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33846.

The product of its digits is 1008, while the sum is 23.

The square root of 642713 is about 801.6938318336. The cubic root of 642713 is about 86.2989863852.

Adding to 642713 its reverse (317246), we get a palindrome (959959).

The spelling of 642713 in words is "six hundred forty-two thousand, seven hundred thirteen".