100028820 has 24 divisors (see below), whose sum is σ = 280080864. Its totient is φ = 26674336.

The previous prime is 100028813. The next prime is 100028839. The reversal of 100028820 is 28820001.

It is a congruent number.

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, 833514 + ... + 833633.

It is an arithmetic number, because the mean of its divisors is an integer number (11670036).

Almost surely, 2^100028820 is an apocalyptic number.

100028820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100028820 is an abundant number, since it is smaller than the sum of its proper divisors (180052044).

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

100028820 is a wasteful number, since it uses less digits than its factorization.

100028820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667159 (or 1667157 counting only the distinct ones).

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

The square root of 100028820 is about 10001.4408961909. The cubic root of 100028820 is about 464.2034692751.

Adding to 100028820 its reverse (28820001), we get a palindrome (128848821).

The spelling of 100028820 in words is "one hundred million, twenty-eight thousand, eight hundred twenty".