28056100 has 18 divisors (see below), whose sum is σ = 60881954. Its totient is φ = 11222400.

The previous prime is 28056097. The next prime is 28056143. The reversal of 28056100 is 165082.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 451584 + 27604516 = 672^2 + 5254^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140181 + ... + 140380.

Almost surely, 2^28056100 is an apocalyptic number.

28056100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28056100 is an abundant number, since it is smaller than the sum of its proper divisors (32825854).

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

28056100 is a wasteful number, since it uses less digits than its factorization.

28056100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280575 (or 280568 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 28056100 is about 5296.8009213109. The cubic root of 28056100 is about 303.8615626597.

The spelling of 28056100 in words is "twenty-eight million, fifty-six thousand, one hundred".