28539649 has 8 divisors (see below), whose sum is σ = 29383200. Its totient is φ = 27703200.

The previous prime is 28539647. The next prime is 28539677. The reversal of 28539649 is 94693582.

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 28539649 - 2¹ = 28539647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28539599 and 28539608.

It is not an unprimeable number, because it can be changed into a prime (28539647) 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, 7002 + ... + 10300.

It is an arithmetic number, because the mean of its divisors is an integer number (3672900).

Almost surely, 2^28539649 is an apocalyptic number.

It is an amenable number.

28539649 is a deficient number, since it is larger than the sum of its proper divisors (843551).

28539649 is a wasteful number, since it uses less digits than its factorization.

28539649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551.

The product of its digits is 466560, while the sum is 46.

The square root of 28539649 is about 5342.2513044596. The cubic root of 28539649 is about 305.5973208707.

The spelling of 28539649 in words is "twenty-eight million, five hundred thirty-nine thousand, six hundred forty-nine".