28447870 has 16 divisors (see below), whose sum is σ = 55861488. Its totient is φ = 10344640.

The previous prime is 28447847. The next prime is 28447889. The reversal of 28447870 is 7874482.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129199 + ... + 129418.

It is an arithmetic number, because the mean of its divisors is an integer number (3491343).

Almost surely, 2^28447870 is an apocalyptic number.

28447870 is a deficient number, since it is larger than the sum of its proper divisors (27413618).

28447870 is a wasteful number, since it uses less digits than its factorization.

28447870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258635.

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 28447870 is about 5333.6544694984. The cubic root of 28447870 is about 305.2693848627.

The spelling of 28447870 in words is "twenty-eight million, four hundred forty-seven thousand, eight hundred seventy".