28948439 has 8 divisors (see below), whose sum is σ = 31291680. Its totient is φ = 26621856.

The previous prime is 28948429. The next prime is 28948463. The reversal of 28948439 is 93484982.

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 28948439 - 2²⁰ = 27899863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28948393 and 28948402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28948429) 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, 419 + ... + 7620.

It is an arithmetic number, because the mean of its divisors is an integer number (3911460).

Almost surely, 2^28948439 is an apocalyptic number.

28948439 is a deficient number, since it is larger than the sum of its proper divisors (2343241).

28948439 is a wasteful number, since it uses less digits than its factorization.

28948439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8329.

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

The square root of 28948439 is about 5380.3753586530. The cubic root of 28948439 is about 307.0494921040.

The spelling of 28948439 in words is "twenty-eight million, nine hundred forty-eight thousand, four hundred thirty-nine".