28871457 has 8 divisors (see below), whose sum is σ = 40759776. Its totient is φ = 18115392.

The previous prime is 28871429. The next prime is 28871459. The reversal of 28871457 is 75417882.

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

It is not a de Polignac number, because 28871457 - 2⁷ = 28871329 is a prime.

It is a super-2 number, since 2×28871457² = 1667122058605698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28871459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283003 + ... + 283104.

It is an arithmetic number, because the mean of its divisors is an integer number (5094972).

Almost surely, 2^28871457 is an apocalyptic number.

It is an amenable number.

28871457 is a deficient number, since it is larger than the sum of its proper divisors (11888319).

28871457 is a wasteful number, since it uses less digits than its factorization.

28871457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566127.

The product of its digits is 125440, while the sum is 42.

The square root of 28871457 is about 5373.2166343821. The cubic root of 28871457 is about 306.7770736415. Note that the first 3 decimals are identical.

The spelling of 28871457 in words is "twenty-eight million, eight hundred seventy-one thousand, four hundred fifty-seven".