28857890 has 8 divisors (see below), whose sum is σ = 51944220. Its totient is φ = 11543152.

The previous prime is 28857889. The next prime is 28857911. The reversal of 28857890 is 9875882.

It can be written as a sum of positive squares in 2 ways, for example, as 27112849 + 1745041 = 5207^2 + 1321^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1442885 + ... + 1442904.

Almost surely, 2^28857890 is an apocalyptic number.

28857890 is a deficient number, since it is larger than the sum of its proper divisors (23086330).

28857890 is a wasteful number, since it uses less digits than its factorization.

28857890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885796.

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 28857890 is about 5371.9540206521. The cubic root of 28857890 is about 306.7290135262.

The spelling of 28857890 in words is "twenty-eight million, eight hundred fifty-seven thousand, eight hundred ninety".