28071049 has 8 divisors (see below), whose sum is σ = 28964360. Its totient is φ = 27184896.

The previous prime is 28071013. The next prime is 28071059. The reversal of 28071049 is 94017082.

It can be written as a sum of positive squares in 4 ways, for example, as 23040000 + 5031049 = 4800^2 + 2243^2 .

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 28071049 - 2¹¹ = 28069001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28071049.

It is not an unprimeable number, because it can be changed into a prime (28071059) 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, 6817 + ... + 10129.

It is an arithmetic number, because the mean of its divisors is an integer number (3620545).

Almost surely, 2^28071049 is an apocalyptic number.

It is an amenable number.

28071049 is a deficient number, since it is larger than the sum of its proper divisors (893311).

28071049 is a wasteful number, since it uses less digits than its factorization.

28071049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28071049 is about 5298.2118681684. The cubic root of 28071049 is about 303.9155214537.

The spelling of 28071049 in words is "twenty-eight million, seventy-one thousand, forty-nine".