28260538 has 4 divisors (see below), whose sum is σ = 42390810. Its totient is φ = 14130268.

The previous prime is 28260527. The next prime is 28260553. The reversal of 28260538 is 83506282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83506282 = 2 ⋅41753141.

It can be written as a sum of positive squares in only one way, i.e., 21040569 + 7219969 = 4587^2 + 2687^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7065133 + ... + 7065136.

Almost surely, 2^28260538 is an apocalyptic number.

28260538 is a deficient number, since it is larger than the sum of its proper divisors (14130272).

28260538 is a wasteful number, since it uses less digits than its factorization.

28260538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14130271.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 28260538 is about 5316.0641455874. The cubic root of 28260538 is about 304.5978323893.

The spelling of 28260538 in words is "twenty-eight million, two hundred sixty thousand, five hundred thirty-eight".