28705900 has 18 divisors (see below), whose sum is σ = 62292020. Its totient is φ = 11482320.

The previous prime is 28705891. The next prime is 28705921. The reversal of 28705900 is 950782.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143430 + ... + 143629.

Almost surely, 2^28705900 is an apocalyptic number.

28705900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28705900 is an abundant number, since it is smaller than the sum of its proper divisors (33586120).

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

28705900 is a wasteful number, since it uses less digits than its factorization.

28705900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287073 (or 287066 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 28705900 is about 5357.7887229714. The cubic root of 28705900 is about 306.1895674175.

The spelling of 28705900 in words is "twenty-eight million, seven hundred five thousand, nine hundred".