521880 has 32 divisors (see below), whose sum is σ = 1566000. Its totient is φ = 139136.

The previous prime is 521879. The next prime is 521881. The reversal of 521880 is 88125.

It is an interprime number because it is at equal distance from previous prime (521879) and next prime (521881).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 521880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521881) 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, 2055 + ... + 2294.

2⁵²¹⁸⁸⁰ is an apocalyptic number.

It is an amenable number.

521880 is an abundant number, since it is smaller than the sum of its proper divisors (1044120).

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

521880 is a wasteful number, since it uses less digits than its factorization.

521880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363 (or 4359 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 521880 is about 722.4126244744. The cubic root of 521880 is about 80.5113084174.

The spelling of 521880 in words is "five hundred twenty-one thousand, eight hundred eighty".