28007107 has 4 divisors (see below), whose sum is σ = 28390840. Its totient is φ = 27623376.

The previous prime is 28007099. The next prime is 28007117. The reversal of 28007107 is 70170082.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28007107 - 2³ = 28007099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28007117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191757 + ... + 191902.

It is an arithmetic number, because the mean of its divisors is an integer number (7097710).

Almost surely, 2^28007107 is an apocalyptic number.

28007107 is a deficient number, since it is larger than the sum of its proper divisors (383733).

28007107 is an equidigital number, since it uses as much as digits as its factorization.

28007107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383732.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 28007107 is about 5292.1741278987. The cubic root of 28007107 is about 303.6845867259.

Adding to 28007107 its reverse (70170082), we get a palindrome (98177189).

The spelling of 28007107 in words is "twenty-eight million, seven thousand, one hundred seven".