28871247 has 8 divisors (see below), whose sum is σ = 38527744. Its totient is φ = 19231128.

The previous prime is 28871231. The next prime is 28871267. The reversal of 28871247 is 74217882.

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

It is not a de Polignac number, because 28871247 - 2⁴ = 28871231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871267) by changing a digit.

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, 888 + ... + 7650.

It is an arithmetic number, because the mean of its divisors is an integer number (4815968).

Almost surely, 2^28871247 is an apocalyptic number.

28871247 is a deficient number, since it is larger than the sum of its proper divisors (9656497).

28871247 is a wasteful number, since it uses less digits than its factorization.

28871247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8189.

The product of its digits is 50176, while the sum is 39.

The square root of 28871247 is about 5373.1970929792. The cubic root of 28871247 is about 306.7763298464.

The spelling of 28871247 in words is "twenty-eight million, eight hundred seventy-one thousand, two hundred forty-seven".