28872297 has 12 divisors (see below), whose sum is σ = 42207984. Its totient is φ = 19015800.

The previous prime is 28872293. The next prime is 28872317. The reversal of 28872297 is 79227882.

It is a happy number.

It is not a de Polignac number, because 28872297 - 2² = 28872293 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28872293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18579 + ... + 20072.

It is an arithmetic number, because the mean of its divisors is an integer number (3517332).

Almost surely, 2^28872297 is an apocalyptic number.

It is an amenable number.

28872297 is a deficient number, since it is larger than the sum of its proper divisors (13335687).

28872297 is a wasteful number, since it uses less digits than its factorization.

28872297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38740 (or 38737 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 28872297 is about 5373.2947992828. The cubic root of 28872297 is about 306.7800487857.

It can be divided in two parts, 2887 and 2297, that added together give a square (5184 = 72²).

The spelling of 28872297 in words is "twenty-eight million, eight hundred seventy-two thousand, two hundred ninety-seven".