642711 has 4 divisors (see below), whose sum is σ = 856952. Its totient is φ = 428472.

The previous prime is 642701. The next prime is 642737. The reversal of 642711 is 117246.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 642711 - 2⁹ = 642199 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642701) 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, 107116 + ... + 107121.

It is an arithmetic number, because the mean of its divisors is an integer number (214238).

2⁶⁴²⁷¹¹ is an apocalyptic number.

642711 is a deficient number, since it is larger than the sum of its proper divisors (214241).

642711 is a wasteful number, since it uses less digits than its factorization.

642711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214240.

The product of its digits is 336, while the sum is 21.

The square root of 642711 is about 801.6925844736. The cubic root of 642711 is about 86.2988968698.

Adding to 642711 its reverse (117246), we get a palindrome (759957).

It can be divided in two parts, 64 and 2711, that added together give a triangular number (2775 = T₇₄).

The spelling of 642711 in words is "six hundred forty-two thousand, seven hundred eleven".