28948393 has 4 divisors (see below), whose sum is σ = 29730820. Its totient is φ = 28165968.

The previous prime is 28948391. The next prime is 28948411. The reversal of 28948393 is 39384982.

28948393 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24334489 + 4613904 = 4933^2 + 2148^2 .

It is a cyclic number.

It is not a de Polignac number, because 28948393 - 2¹ = 28948391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28948391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391158 + ... + 391231.

It is an arithmetic number, because the mean of its divisors is an integer number (7432705).

Almost surely, 2^28948393 is an apocalyptic number.

It is an amenable number.

28948393 is a deficient number, since it is larger than the sum of its proper divisors (782427).

28948393 is an equidigital number, since it uses as much as digits as its factorization.

28948393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782426.

The product of its digits is 373248, while the sum is 46.

The square root of 28948393 is about 5380.3710838566. The cubic root of 28948393 is about 307.0493294667.

The spelling of 28948393 in words is "twenty-eight million, nine hundred forty-eight thousand, three hundred ninety-three".