521253028 has 12 divisors (see below), whose sum is σ = 912478000. Its totient is φ = 260545032.

The previous prime is 521253001. The next prime is 521253043. The reversal of 521253028 is 820352125.

It is a junction number, because it is equal to n+sod(n) for n = 521252987 and 521253005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4626 + ... + 32617.

Almost surely, 2^521253028 is an apocalyptic number.

It is an amenable number.

521253028 is a deficient number, since it is larger than the sum of its proper divisors (391224972).

521253028 is a wasteful number, since it uses less digits than its factorization.

521253028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40746 (or 40744 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 521253028 is about 22830.9664272015. The cubic root of 521253028 is about 804.7905415461.

The spelling of 521253028 in words is "five hundred twenty-one million, two hundred fifty-three thousand, twenty-eight".