420528 has 20 divisors (see below), whose sum is σ = 1086488. Its totient is φ = 140160.

The previous prime is 420521. The next prime is 420551. The reversal of 420528 is 825024.

It is not an unprimeable number, because it can be changed into a prime (420521) by changing a digit.

420528 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4333 + ... + 4428.

2⁴²⁰⁵²⁸ is an apocalyptic number.

420528 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

420528 is an abundant number, since it is smaller than the sum of its proper divisors (665960).

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

420528 is a wasteful number, since it uses less digits than its factorization.

420528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8772 (or 8766 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 420528 is about 648.4813027374. The cubic root of 420528 is about 74.9200926723.

Subtracting 420528 from its reverse (825024), we obtain a square (404496 = 636²).

The spelling of 420528 in words is "four hundred twenty thousand, five hundred twenty-eight".