28438871 has 16 divisors (see below), whose sum is σ = 30185568. Its totient is φ = 26764800.

The previous prime is 28438853. The next prime is 28438889. The reversal of 28438871 is 17883482.

It is an interprime number because it is at equal distance from previous prime (28438853) and next prime (28438889).

It is a de Polignac number, because none of the positive numbers 2^k-28438871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28438831) 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, 207515 + ... + 207651.

It is an arithmetic number, because the mean of its divisors is an integer number (1886598).

Almost surely, 2^28438871 is an apocalyptic number.

28438871 is a deficient number, since it is larger than the sum of its proper divisors (1746697).

28438871 is a wasteful number, since it uses less digits than its factorization.

28438871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322.

The product of its digits is 86016, while the sum is 41.

The square root of 28438871 is about 5332.8107973188. The cubic root of 28438871 is about 305.2371925414.

The spelling of 28438871 in words is "twenty-eight million, four hundred thirty-eight thousand, eight hundred seventy-one".