100331028 has 72 divisors (see below), whose sum is σ = 302601600. Its totient is φ = 28664496.

The previous prime is 100331017. The next prime is 100331051. The reversal of 100331028 is 820133001.

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

It is a self number, because there is not a number n which added to its sum of digits gives 100331028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4188 + ... + 14771.

It is an arithmetic number, because the mean of its divisors is an integer number (4202800).

Almost surely, 2^100331028 is an apocalyptic number.

100331028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

100331028 is an abundant number, since it is smaller than the sum of its proper divisors (202270572).

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

100331028 is a wasteful number, since it uses less digits than its factorization.

100331028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18986 (or 18971 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 100331028 is about 10016.5377251823. The cubic root of 100331028 is about 464.6704845509.

Adding to 100331028 its reverse (820133001), we get a palindrome (920464029).

The spelling of 100331028 in words is "one hundred million, three hundred thirty-one thousand, twenty-eight".