28424307 has 4 divisors (see below), whose sum is σ = 37899080. Its totient is φ = 18949536.

The previous prime is 28424287. The next prime is 28424309. The reversal of 28424307 is 70342482.

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

It is not a de Polignac number, because 28424307 - 2⁶ = 28424243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28424309) 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, 4737382 + ... + 4737387.

It is an arithmetic number, because the mean of its divisors is an integer number (9474770).

Almost surely, 2^28424307 is an apocalyptic number.

28424307 is a deficient number, since it is larger than the sum of its proper divisors (9474773).

28424307 is an equidigital number, since it uses as much as digits as its factorization.

28424307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9474772.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 28424307 is about 5331.4451136629. The cubic root of 28424307 is about 305.1850780305.

Adding to 28424307 its reverse (70342482), we get a palindrome (98766789).

The spelling of 28424307 in words is "twenty-eight million, four hundred twenty-four thousand, three hundred seven".