28272405 has 48 divisors (see below), whose sum is σ = 54149760. Its totient is φ = 12338304.

The previous prime is 28272401. The next prime is 28272443. The reversal of 28272405 is 50427282.

It is not a de Polignac number, because 28272405 - 2² = 28272401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28272401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55291 + ... + 55799.

It is an arithmetic number, because the mean of its divisors is an integer number (1128120).

Almost surely, 2^28272405 is an apocalyptic number.

It is an amenable number.

28272405 is a deficient number, since it is larger than the sum of its proper divisors (25877355).

28272405 is a wasteful number, since it uses less digits than its factorization.

28272405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28272405 is about 5317.1801737387. The cubic root of 28272405 is about 304.6404614038.

Adding to 28272405 its reverse (50427282), we get a palindrome (78699687).

The spelling of 28272405 in words is "twenty-eight million, two hundred seventy-two thousand, four hundred five".