28508107 has 2 divisors, whose sum is σ = 28508108. Its totient is φ = 28508106.

The previous prime is 28508101. The next prime is 28508141. The reversal of 28508107 is 70180582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28508107 is a prime.

It is not a weakly prime, because it can be changed into another prime (28508101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14254053 + 14254054.

It is an arithmetic number, because the mean of its divisors is an integer number (14254054).

Almost surely, 2^28508107 is an apocalyptic number.

28508107 is a deficient number, since it is larger than the sum of its proper divisors (1).

28508107 is an equidigital number, since it uses as much as digits as its factorization.

28508107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 28508107 is about 5339.2983621446. The cubic root of 28508107 is about 305.4846973887.

Adding to 28508107 its reverse (70180582), we get a palindrome (98688689).

The spelling of 28508107 in words is "twenty-eight million, five hundred eight thousand, one hundred seven".