28256971 has 8 divisors (see below), whose sum is σ = 29810000. Its totient is φ = 26710560.

The previous prime is 28256951. The next prime is 28256981. The reversal of 28256971 is 17965282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28256971 - 2⁵ = 28256939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28256951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8905 + ... + 11653.

It is an arithmetic number, because the mean of its divisors is an integer number (3726250).

Almost surely, 2^28256971 is an apocalyptic number.

28256971 is a deficient number, since it is larger than the sum of its proper divisors (1553029).

28256971 is a wasteful number, since it uses less digits than its factorization.

28256971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309.

The product of its digits is 60480, while the sum is 40.

The square root of 28256971 is about 5315.7286424346. The cubic root of 28256971 is about 304.5850165661.

The spelling of 28256971 in words is "twenty-eight million, two hundred fifty-six thousand, nine hundred seventy-one".