28520107 has 16 divisors (see below), whose sum is σ = 36288000. Its totient is φ = 22220520.

The previous prime is 28520099. The next prime is 28520111. The reversal of 28520107 is 70102582.

It is not a de Polignac number, because 28520107 - 2³ = 28520099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28521107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7 + ... + 7552.

It is an arithmetic number, because the mean of its divisors is an integer number (2268000).

Almost surely, 2^28520107 is an apocalyptic number.

28520107 is a deficient number, since it is larger than the sum of its proper divisors (7767893).

28520107 is an equidigital number, since it uses as much as digits as its factorization.

28520107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7591 (or 7577 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 28520107 is about 5340.4219870718. The cubic root of 28520107 is about 305.5275542286.

Adding to 28520107 its reverse (70102582), we get a palindrome (98622689).

The spelling of 28520107 in words is "twenty-eight million, five hundred twenty thousand, one hundred seven".