521975428 has 72 divisors (see below), whose sum is σ = 1042682760. Its totient is φ = 228234240.

The previous prime is 521975423. The next prime is 521975449. The reversal of 521975428 is 824579125.

It can be written as a sum of positive squares in 12 ways, for example, as 200562244 + 321413184 = 14162^2 + 17928^2 .

It is not an unprimeable number, because it can be changed into a prime (521975423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1025238 + ... + 1025746.

It is an arithmetic number, because the mean of its divisors is an integer number (14481705).

Almost surely, 2^521975428 is an apocalyptic number.

It is an amenable number.

521975428 is a deficient number, since it is larger than the sum of its proper divisors (520707332).

521975428 is a wasteful number, since it uses less digits than its factorization.

521975428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 602 counting only the distinct ones).

The product of its digits is 201600, while the sum is 43.

The square root of 521975428 is about 22846.7815676519. The cubic root of 521975428 is about 805.1621539786.

The spelling of 521975428 in words is "five hundred twenty-one million, nine hundred seventy-five thousand, four hundred twenty-eight".