523021220 has 24 divisors (see below), whose sum is σ = 1104420408. Its totient is φ = 208051200.

The previous prime is 523021193. The next prime is 523021231. The reversal of 523021220 is 22120325.

It can be written as a sum of positive squares in 4 ways, for example, as 61716736 + 461304484 = 7856^2 + 21478^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68621 + ... + 75860.

It is an arithmetic number, because the mean of its divisors is an integer number (46017517).

Almost surely, 2^523021220 is an apocalyptic number.

It is an amenable number.

523021220 is an abundant number, since it is smaller than the sum of its proper divisors (581399188).

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

523021220 is a wasteful number, since it uses less digits than its factorization.

523021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144671 (or 144669 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 523021220 is about 22869.6571902598. The cubic root of 523021220 is about 805.6995167065.

Adding to 523021220 its reverse (22120325), we get a palindrome (545141545).

The spelling of 523021220 in words is "five hundred twenty-three million, twenty-one thousand, two hundred twenty".