28138485 has 24 divisors (see below), whose sum is σ = 47833056. Its totient is φ = 14122240.

The previous prime is 28138471. The next prime is 28138493. The reversal of 28138485 is 58483182.

It is not a de Polignac number, because 28138485 - 2¹⁵ = 28105717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1090 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (1993044).

Almost surely, 2^28138485 is an apocalyptic number.

It is an amenable number.

28138485 is a deficient number, since it is larger than the sum of its proper divisors (19694571).

28138485 is a wasteful number, since it uses less digits than its factorization.

28138485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6533 (or 6516 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 28138485 is about 5304.5720845324. The cubic root of 28138485 is about 304.1586955648.

The spelling of 28138485 in words is "twenty-eight million, one hundred thirty-eight thousand, four hundred eighty-five".