1028520 has 48 divisors (see below), whose sum is σ = 3343860. Its totient is φ = 274176.

The previous prime is 1028509. The next prime is 1028557. The reversal of 1028520 is 258201.

It can be written as a sum of positive squares in 2 ways, for example, as 1028196 + 324 = 1014^2 + 18^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1028493 and 1028502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1069 + ... + 1788.

2^1028520 is an apocalyptic number.

1028520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028520 is an abundant number, since it is smaller than the sum of its proper divisors (2315340).

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

1028520 is a wasteful number, since it uses less digits than its factorization.

1028520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874 (or 2867 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1028520 is about 1014.1597507296. The cubic root of 1028520 is about 100.9417695255.

The spelling of 1028520 in words is "one million, twenty-eight thousand, five hundred twenty".