521725460 has 12 divisors (see below), whose sum is σ = 1095623508. Its totient is φ = 208690176.

The previous prime is 521725459. The next prime is 521725483. The reversal of 521725460 is 64527125.

It can be written as a sum of positive squares in 2 ways, for example, as 219869584 + 301855876 = 14828^2 + 17374^2 .

It is a super-2 number, since 2×521725460² = 544394911224423200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13043117 + ... + 13043156.

It is an arithmetic number, because the mean of its divisors is an integer number (91301959).

Almost surely, 2^521725460 is an apocalyptic number.

It is an amenable number.

521725460 is an abundant number, since it is smaller than the sum of its proper divisors (573898048).

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

521725460 is a wasteful number, since it uses less digits than its factorization.

521725460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26086282 (or 26086280 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 521725460 is about 22841.3103827254. The cubic root of 521725460 is about 805.0336058396.

The spelling of 521725460 in words is "five hundred twenty-one million, seven hundred twenty-five thousand, four hundred sixty".