521628252 has 12 divisors (see below), whose sum is σ = 1217132616. Its totient is φ = 173876080.

The previous prime is 521628229. The next prime is 521628253. The reversal of 521628252 is 252826125.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521628253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21734499 + ... + 21734522.

It is an arithmetic number, because the mean of its divisors is an integer number (101427718).

Almost surely, 2^521628252 is an apocalyptic number.

It is an amenable number.

521628252 is an abundant number, since it is smaller than the sum of its proper divisors (695504364).

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

521628252 is a wasteful number, since it uses less digits than its factorization.

521628252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43469028 (or 43469026 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 521628252 is about 22839.1823846652. The cubic root of 521628252 is about 804.9836047225.

The spelling of 521628252 in words is "five hundred twenty-one million, six hundred twenty-eight thousand, two hundred fifty-two".