28748439 has 30 divisors (see below), whose sum is σ = 44748704. Its totient is φ = 18374040.

The previous prime is 28748429. The next prime is 28748449. The reversal of 28748439 is 93484782.

It is an interprime number because it is at equal distance from previous prime (28748429) and next prime (28748449).

It is not a de Polignac number, because 28748439 - 2¹¹ = 28746391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28748394 and 28748403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28748429) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 268624 + ... + 268730.

Almost surely, 2^28748439 is an apocalyptic number.

28748439 is a deficient number, since it is larger than the sum of its proper divisors (16000265).

28748439 is an equidigital number, since it uses as much as digits as its factorization.

28748439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 141 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28748439 is about 5361.7570814053. The cubic root of 28748439 is about 306.3407392373.

The spelling of 28748439 in words is "twenty-eight million, seven hundred forty-eight thousand, four hundred thirty-nine".