28147307 has 4 divisors (see below), whose sum is σ = 28624440. Its totient is φ = 27670176.

The previous prime is 28147297. The next prime is 28147309. The reversal of 28147307 is 70374182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70374182 = 2 ⋅35187091.

It is a cyclic number.

It is not a de Polignac number, because 28147307 - 2⁶ = 28147243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28147309) 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, 238478 + ... + 238595.

It is an arithmetic number, because the mean of its divisors is an integer number (7156110).

Almost surely, 2^28147307 is an apocalyptic number.

28147307 is a deficient number, since it is larger than the sum of its proper divisors (477133).

28147307 is an equidigital number, since it uses as much as digits as its factorization.

28147307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477132.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 28147307 is about 5305.4035661767. The cubic root of 28147307 is about 304.1904789347.

The spelling of 28147307 in words is "twenty-eight million, one hundred forty-seven thousand, three hundred seven".