28307427 has 4 divisors (see below), whose sum is σ = 37743240. Its totient is φ = 18871616.

The previous prime is 28307381. The next prime is 28307441. The reversal of 28307427 is 72470382.

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 28307427 - 2¹⁶ = 28241891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28307527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4717902 + ... + 4717907.

It is an arithmetic number, because the mean of its divisors is an integer number (9435810).

Almost surely, 2^28307427 is an apocalyptic number.

28307427 is a deficient number, since it is larger than the sum of its proper divisors (9435813).

28307427 is an equidigital number, since it uses as much as digits as its factorization.

28307427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9435812.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 28307427 is about 5320.4724414285. The cubic root of 28307427 is about 304.7661990369.

The spelling of 28307427 in words is "twenty-eight million, three hundred seven thousand, four hundred twenty-seven".