28448939 has 8 divisors (see below), whose sum is σ = 30462480. Its totient is φ = 26473216.

The previous prime is 28448921. The next prime is 28448977. The reversal of 28448939 is 93984482.

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

It is not a de Polignac number, because 28448939 - 2²⁰ = 27400363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28448893 and 28448902.

It is not an unprimeable number, because it can be changed into a prime (28448989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7889 + ... + 10914.

It is an arithmetic number, because the mean of its divisors is an integer number (3807810).

Almost surely, 2^28448939 is an apocalyptic number.

28448939 is a deficient number, since it is larger than the sum of its proper divisors (2013541).

28448939 is a wasteful number, since it uses less digits than its factorization.

28448939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18909.

The product of its digits is 497664, while the sum is 47.

The square root of 28448939 is about 5333.7546812728. The cubic root of 28448939 is about 305.2732085688.

The spelling of 28448939 in words is "twenty-eight million, four hundred forty-eight thousand, nine hundred thirty-nine".