28047900 has 36 divisors (see below), whose sum is σ = 81152792. Its totient is φ = 7479360.

The previous prime is 28047889. The next prime is 28047907. The reversal of 28047900 is 974082.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28047907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46447 + ... + 47046.

Almost surely, 2^28047900 is an apocalyptic number.

28047900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28047900 is an abundant number, since it is smaller than the sum of its proper divisors (53104892).

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

28047900 is a wasteful number, since it uses less digits than its factorization.

28047900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93510 (or 93503 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 28047900 is about 5296.0268126209. The cubic root of 28047900 is about 303.8319564112.

The spelling of 28047900 in words is "twenty-eight million, forty-seven thousand, nine hundred".