28857145 has 8 divisors (see below), whose sum is σ = 34723656. Its totient is φ = 23022336.

The previous prime is 28857139. The next prime is 28857193. The reversal of 28857145 is 54175882.

It can be written as a sum of positive squares in 4 ways, for example, as 2601769 + 26255376 = 1613^2 + 5124^2 .

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 28857145 - 2³ = 28857137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28857098 and 28857107.

It is an unprimeable number.

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, 5872 + ... + 9601.

It is an arithmetic number, because the mean of its divisors is an integer number (4340457).

Almost surely, 2^28857145 is an apocalyptic number.

It is an amenable number.

28857145 is a deficient number, since it is larger than the sum of its proper divisors (5866511).

28857145 is a wasteful number, since it uses less digits than its factorization.

28857145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15851.

The product of its digits is 89600, while the sum is 40.

The square root of 28857145 is about 5371.8846785835. The cubic root of 28857145 is about 306.7263739814.

The spelling of 28857145 in words is "twenty-eight million, eight hundred fifty-seven thousand, one hundred forty-five".