28487447 has 16 divisors (see below), whose sum is σ = 30369600. Its totient is φ = 26687232.

The previous prime is 28487443. The next prime is 28487449. The reversal of 28487447 is 74478482.

It is a cyclic number.

It is not a de Polignac number, because 28487447 - 2² = 28487443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28487398 and 28487407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28487443) 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, 143054 + ... + 143252.

It is an arithmetic number, because the mean of its divisors is an integer number (1898100).

Almost surely, 2^28487447 is an apocalyptic number.

28487447 is a deficient number, since it is larger than the sum of its proper divisors (1882153).

28487447 is a wasteful number, since it uses less digits than its factorization.

28487447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362.

The product of its digits is 401408, while the sum is 44.

The square root of 28487447 is about 5337.3633003572. The cubic root of 28487447 is about 305.4108840102.

The spelling of 28487447 in words is "twenty-eight million, four hundred eighty-seven thousand, four hundred forty-seven".