520213428 has 144 divisors (see below), whose sum is σ = 1576009344. Its totient is φ = 146966400.

The previous prime is 520213427. The next prime is 520213439. The reversal of 520213428 is 824312025.

520213428 is a `hidden beast` number, since 5 + 20 + 213 + 428 = 666.

It is a super-2 number, since 2×520213428² = 541244021343022368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520213423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 686826 + ... + 687582.

Almost surely, 2^520213428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520213428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (788004672).

520213428 is an abundant number, since it is smaller than the sum of its proper divisors (1055795916).

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

520213428 is a wasteful number, since it uses less digits than its factorization.

520213428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 520213428 is about 22808.1877403708. The cubic root of 520213428 is about 804.2551540358.

The spelling of 520213428 in words is "five hundred twenty million, two hundred thirteen thousand, four hundred twenty-eight".