28748238 has 8 divisors (see below), whose sum is σ = 57496488. Its totient is φ = 9582744.

The previous prime is 28748231. The next prime is 28748243. The reversal of 28748238 is 83284782.

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

28748238 is an admirable number.

It is a super-2 number, since 2×28748238² = 1652922376209288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28748238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28748231) 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, 2395681 + ... + 2395692.

It is an arithmetic number, because the mean of its divisors is an integer number (7187061).

Almost surely, 2^28748238 is an apocalyptic number.

28748238 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28748238 is a wasteful number, since it uses less digits than its factorization.

28748238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4791378.

The product of its digits is 172032, while the sum is 42.

The square root of 28748238 is about 5361.7383375170. The cubic root of 28748238 is about 306.3400252898.

The spelling of 28748238 in words is "twenty-eight million, seven hundred forty-eight thousand, two hundred thirty-eight".