521760 has 48 divisors (see below), whose sum is σ = 1645056. Its totient is φ = 139008.

The previous prime is 521753. The next prime is 521767. The reversal of 521760 is 67125.

521760 = T₃₃₆ + T₃₃₇ + ... + T₃₄₄.

It is an interprime number because it is at equal distance from previous prime (521753) and next prime (521767).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64 + ... + 1023.

It is an arithmetic number, because the mean of its divisors is an integer number (34272).

2⁵²¹⁷⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822528).

521760 is an abundant number, since it is smaller than the sum of its proper divisors (1123296).

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

521760 is a wasteful number, since it uses less digits than its factorization.

521760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 521760 is about 722.3295646725. The cubic root of 521760 is about 80.5051370769.

Adding to 521760 its reverse (67125), we get a palindrome (588885).

The spelling of 521760 in words is "five hundred twenty-one thousand, seven hundred sixty".