28125117 has 8 divisors (see below), whose sum is σ = 41666880. Its totient is φ = 18750060.

The previous prime is 28125107. The next prime is 28125127. The reversal of 28125117 is 71152182.

It is an interprime number because it is at equal distance from previous prime (28125107) and next prime (28125127).

It is not a de Polignac number, because 28125117 - 2⁷ = 28124989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1041671 = 28125117 / (2 + 8 + 1 + 2 + 5 + 1 + 1 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28125107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520809 + ... + 520862.

It is an arithmetic number, because the mean of its divisors is an integer number (5208360).

Almost surely, 2^28125117 is an apocalyptic number.

28125117 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28125117 is a deficient number, since it is larger than the sum of its proper divisors (13541763).

28125117 is a wasteful number, since it uses less digits than its factorization.

28125117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041680 (or 1041674 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 28125117 is about 5303.3118897534. The cubic root of 28125117 is about 304.1105214774.

Adding to 28125117 its reverse (71152182), we get a palindrome (99277299).

The spelling of 28125117 in words is "twenty-eight million, one hundred twenty-five thousand, one hundred seventeen".