28507107 has 4 divisors (see below), whose sum is σ = 38009480. Its totient is φ = 19004736.

The previous prime is 28507033. The next prime is 28507109. The reversal of 28507107 is 70170582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28507107 - 2¹⁰ = 28506083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28507109) 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 3 ways as a sum of consecutive naturals, for example, 4751182 + ... + 4751187.

It is an arithmetic number, because the mean of its divisors is an integer number (9502370).

Almost surely, 2^28507107 is an apocalyptic number.

28507107 is a deficient number, since it is larger than the sum of its proper divisors (9502373).

28507107 is an equidigital number, since it uses as much as digits as its factorization.

28507107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9502372.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 28507107 is about 5339.2047160602. The cubic root of 28507107 is about 305.4811254426.

Adding to 28507107 its reverse (70170582), we get a palindrome (98677689).

The spelling of 28507107 in words is "twenty-eight million, five hundred seven thousand, one hundred seven".