28857399 has 8 divisors (see below), whose sum is σ = 39415152. Its totient is φ = 18768960.

The previous prime is 28857391. The next prime is 28857419. The reversal of 28857399 is 99375882.

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

It is not a de Polignac number, because 28857399 - 2³ = 28857391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28857391) 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, 117184 + ... + 117429.

It is an arithmetic number, because the mean of its divisors is an integer number (4926894).

Almost surely, 2^28857399 is an apocalyptic number.

28857399 is a deficient number, since it is larger than the sum of its proper divisors (10557753).

28857399 is a wasteful number, since it uses less digits than its factorization.

28857399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234657.

The product of its digits is 1088640, while the sum is 51.

The square root of 28857399 is about 5371.9083201410. The cubic root of 28857399 is about 306.7272739118.

The spelling of 28857399 in words is "twenty-eight million, eight hundred fifty-seven thousand, three hundred ninety-nine".