521222828 has 12 divisors (see below), whose sum is σ = 1042445712. Its totient is φ = 223381200.

The previous prime is 521222827. The next prime is 521222843. The reversal of 521222828 is 828222125.

521222828 is an admirable number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 521222794 and 521222803.

It is not an unprimeable number, because it can be changed into a prime (521222827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9307523 + ... + 9307578.

It is an arithmetic number, because the mean of its divisors is an integer number (86870476).

Almost surely, 2^521222828 is an apocalyptic number.

It is an amenable number.

521222828 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

521222828 is a wasteful number, since it uses less digits than its factorization.

521222828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18615112 (or 18615110 counting only the distinct ones).

The product of its digits is 10240, while the sum is 32.

The square root of 521222828 is about 22830.3050351939. The cubic root of 521222828 is about 804.7749987787.

The spelling of 521222828 in words is "five hundred twenty-one million, two hundred twenty-two thousand, eight hundred twenty-eight".