711640 has 16 divisors (see below), whose sum is σ = 1601280. Its totient is φ = 284640.

The previous prime is 711629. The next prime is 711649. The reversal of 711640 is 46117.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (711649) by changing a digit.

711640 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 in 3 ways as a sum of consecutive naturals, for example, 8856 + ... + 8935.

It is an arithmetic number, because the mean of its divisors is an integer number (100080).

2⁷¹¹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

711640 is an abundant number, since it is smaller than the sum of its proper divisors (889640).

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

711640 is a wasteful number, since it uses less digits than its factorization.

711640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17802 (or 17798 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 711640 is about 843.5875769593. The cubic root of 711640 is about 89.2798496719.

Adding to 711640 its reverse (46117), we get a palindrome (757757).

It can be divided in two parts, 71 and 1640, that added together give a triangular number (1711 = T₅₈).

The spelling of 711640 in words is "seven hundred eleven thousand, six hundred forty".