28200447 has 16 divisors (see below), whose sum is σ = 45576960. Its totient is φ = 17091000.

The previous prime is 28200439. The next prime is 28200449. The reversal of 28200447 is 74400282.

It is not a de Polignac number, because 28200447 - 2³ = 28200439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 28200447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28200449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47179 + ... + 47772.

It is an arithmetic number, because the mean of its divisors is an integer number (2848560).

Almost surely, 2^28200447 is an apocalyptic number.

28200447 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28200447 is a deficient number, since it is larger than the sum of its proper divisors (17376513).

28200447 is a wasteful number, since it uses less digits than its factorization.

28200447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94971 (or 94965 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 28200447 is about 5310.4093062588. The cubic root of 28200447 is about 304.3817881796.

The spelling of 28200447 in words is "twenty-eight million, two hundred thousand, four hundred forty-seven".