28680100 has 18 divisors (see below), whose sum is σ = 62236034. Its totient is φ = 11472000.

The previous prime is 28680083. The next prime is 28680107. The reversal of 28680100 is 108682.

It can be written as a sum of positive squares in 3 ways, for example, as 9108324 + 19571776 = 3018^2 + 4424^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (28680107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143301 + ... + 143500.

Almost surely, 2^28680100 is an apocalyptic number.

28680100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28680100 is an abundant number, since it is smaller than the sum of its proper divisors (33555934).

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

28680100 is a wasteful number, since it uses less digits than its factorization.

28680100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286815 (or 286808 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28680100 is about 5355.3804720113. The cubic root of 28680100 is about 306.0978085957.

Adding to 28680100 its reverse (108682), we get a palindrome (28788782).

The spelling of 28680100 in words is "twenty-eight million, six hundred eighty thousand, one hundred".