28761117 has 32 divisors (see below), whose sum is σ = 50334720. Its totient is φ = 14152320.

The previous prime is 28761113. The next prime is 28761137. The reversal of 28761117 is 71116782.

It is not a de Polignac number, because 28761117 - 2² = 28761113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28761113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1113 + ... + 7665.

It is an arithmetic number, because the mean of its divisors is an integer number (1572960).

Almost surely, 2^28761117 is an apocalyptic number.

It is an amenable number.

28761117 is a deficient number, since it is larger than the sum of its proper divisors (21573603).

28761117 is a wasteful number, since it uses less digits than its factorization.

28761117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6593.

The product of its digits is 4704, while the sum is 33.

The square root of 28761117 is about 5362.9392127825. The cubic root of 28761117 is about 306.3857644892.

Adding to 28761117 its reverse (71116782), we get a palindrome (99877899).

It can be divided in two parts, 2876 and 1117, that added together give a palindrome (3993).

The spelling of 28761117 in words is "twenty-eight million, seven hundred sixty-one thousand, one hundred seventeen".