28630100 has 18 divisors (see below), whose sum is σ = 62127534. Its totient is φ = 11452000.

The previous prime is 28630061. The next prime is 28630109. The reversal of 28630100 is 103682.

It can be written as a sum of positive squares in 3 ways, for example, as 1214404 + 27415696 = 1102^2 + 5236^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28630109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143051 + ... + 143250.

Almost surely, 2^28630100 is an apocalyptic number.

28630100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28630100 is an abundant number, since it is smaller than the sum of its proper divisors (33497434).

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

28630100 is a wasteful number, since it uses less digits than its factorization.

28630100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286315 (or 286308 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 28630100 is about 5350.7102332307. The cubic root of 28630100 is about 305.9198246384.

Adding to 28630100 its reverse (103682), we get a palindrome (28733782).

The spelling of 28630100 in words is "twenty-eight million, six hundred thirty thousand, one hundred".