28038755 has 4 divisors (see below), whose sum is σ = 33646512. Its totient is φ = 22431000.

The previous prime is 28038733. The next prime is 28038757. The reversal of 28038755 is 55783082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55783082 = 2 ⋅27891541.

It is not a de Polignac number, because 28038755 - 2⁶ = 28038691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28038757) 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, 2803871 + ... + 2803880.

It is an arithmetic number, because the mean of its divisors is an integer number (8411628).

Almost surely, 2^28038755 is an apocalyptic number.

28038755 is a deficient number, since it is larger than the sum of its proper divisors (5607757).

28038755 is an equidigital number, since it uses as much as digits as its factorization.

28038755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5607756.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 28038755 is about 5295.1633591420. The cubic root of 28038755 is about 303.7989314162.

The spelling of 28038755 in words is "twenty-eight million, thirty-eight thousand, seven hundred fifty-five".