28515100 has 18 divisors (see below), whose sum is σ = 61877984. Its totient is φ = 11406000.

The previous prime is 28515089. The next prime is 28515107. The reversal of 28515100 is 151582.

It is a super-2 number, since 2×28515100² = 1626221856020000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28515107) 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, 142476 + ... + 142675.

Almost surely, 2^28515100 is an apocalyptic number.

28515100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28515100 is an abundant number, since it is smaller than the sum of its proper divisors (33362884).

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

28515100 is a wasteful number, since it uses less digits than its factorization.

28515100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285165 (or 285158 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 28515100 is about 5339.9531833154. The cubic root of 28515100 is about 305.5096736740.

Adding to 28515100 its reverse (151582), we get a palindrome (28666682).

The spelling of 28515100 in words is "twenty-eight million, five hundred fifteen thousand, one hundred".