28701117 has 24 divisors (see below), whose sum is σ = 44324280. Its totient is φ = 17832960.

The previous prime is 28701073. The next prime is 28701119. The reversal of 28701117 is 71110782.

It can be written as a sum of positive squares in 4 ways, for example, as 13793796 + 14907321 = 3714^2 + 3861^2 .

It is not a de Polignac number, because 28701117 - 2¹² = 28697021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28701119) by changing a digit.

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, 15817 + ... + 17537.

It is an arithmetic number, because the mean of its divisors is an integer number (1846845).

Almost surely, 2^28701117 is an apocalyptic number.

It is an amenable number.

28701117 is a deficient number, since it is larger than the sum of its proper divisors (15623163).

28701117 is a wasteful number, since it uses less digits than its factorization.

28701117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853 (or 1850 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 28701117 is about 5357.3423448572. The cubic root of 28701117 is about 306.1725606228.

Adding to 28701117 its reverse (71110782), we get a palindrome (99811899).

The spelling of 28701117 in words is "twenty-eight million, seven hundred one thousand, one hundred seventeen".