28135100 has 36 divisors (see below), whose sum is σ = 69776784. Its totient is φ = 9646080.

The previous prime is 28135087. The next prime is 28135111. The reversal of 28135100 is 153182.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19397 + ... + 20796.

It is an arithmetic number, because the mean of its divisors is an integer number (1938244).

Almost surely, 2^28135100 is an apocalyptic number.

28135100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28135100 is an abundant number, since it is smaller than the sum of its proper divisors (41641684).

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

28135100 is a wasteful number, since it uses less digits than its factorization.

28135100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40214 (or 40207 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 28135100 is about 5304.2530105567. The cubic root of 28135100 is about 304.1464985272.

Adding to 28135100 its reverse (153182), we get a palindrome (28288282).

The spelling of 28135100 in words is "twenty-eight million, one hundred thirty-five thousand, one hundred".