511720 has 32 divisors (see below), whose sum is σ = 1257120. Its totient is φ = 185920.

The previous prime is 511711. The next prime is 511723. The reversal of 511720 is 27115.

It is a junction number, because it is equal to n+sod(n) for n = 511694 and 511703.

It is not an unprimeable number, because it can be changed into a prime (511723) by changing a digit.

511720 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 7 ways as a sum of consecutive naturals, for example, 142 + ... + 1021.

It is an arithmetic number, because the mean of its divisors is an integer number (39285).

2⁵¹¹⁷²⁰ is an apocalyptic number.

It is an amenable number.

511720 is an abundant number, since it is smaller than the sum of its proper divisors (745400).

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

511720 is a wasteful number, since it uses less digits than its factorization.

511720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185 (or 1181 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 511720 is about 715.3460700947. The cubic root of 511720 is about 79.9854140074.

Adding to 511720 its reverse (27115), we get a palindrome (538835).

It can be divided in two parts, 51 and 1720, that added together give a palindrome (1771).

The spelling of 511720 in words is "five hundred eleven thousand, seven hundred twenty".