1028820 has 48 divisors (see below), whose sum is σ = 3104640. Its totient is φ = 253056.

The previous prime is 1028809. The next prime is 1028837. The reversal of 1028820 is 288201.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121 + ... + 1439.

It is an arithmetic number, because the mean of its divisors is an integer number (64680).

2^1028820 is an apocalyptic number.

1028820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1028820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1552320).

1028820 is an abundant number, since it is smaller than the sum of its proper divisors (2075820).

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

1028820 is a wasteful number, since it uses less digits than its factorization.

1028820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 1028820 is about 1014.3076456381. The cubic root of 1028820 is about 100.9515828453.

The spelling of 1028820 in words is "one million, twenty-eight thousand, eight hundred twenty".