28920849 has 8 divisors (see below), whose sum is σ = 38704512. Its totient is φ = 19208880.

The previous prime is 28920833. The next prime is 28920863. The reversal of 28920849 is 94802982.

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

It is not a de Polignac number, because 28920849 - 2⁴ = 28920833 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28920849.

It is not an unprimeable number, because it can be changed into a prime (28920809) 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, 16974 + ... + 18599.

It is an arithmetic number, because the mean of its divisors is an integer number (4838064).

Almost surely, 2^28920849 is an apocalyptic number.

It is an amenable number.

28920849 is a deficient number, since it is larger than the sum of its proper divisors (9783663).

28920849 is a wasteful number, since it uses less digits than its factorization.

28920849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35847.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 28920849 is about 5377.8107999445. The cubic root of 28920849 is about 306.9519141513.

The spelling of 28920849 in words is "twenty-eight million, nine hundred twenty thousand, eight hundred forty-nine".