28540307 has 2 divisors, whose sum is σ = 28540308. Its totient is φ = 28540306.

The previous prime is 28540301. The next prime is 28540313. The reversal of 28540307 is 70304582.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (28540301) and next prime (28540313).

It is a cyclic number.

It is not a de Polignac number, because 28540307 - 2⁸ = 28540051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28540307.

It is not a weakly prime, because it can be changed into another prime (28540301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14270153 + 14270154.

It is an arithmetic number, because the mean of its divisors is an integer number (14270154).

Almost surely, 2^28540307 is an apocalyptic number.

28540307 is a deficient number, since it is larger than the sum of its proper divisors (1).

28540307 is an equidigital number, since it uses as much as digits as its factorization.

28540307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 28540307 is about 5342.3128886279. The cubic root of 28540307 is about 305.5996694337.

Adding to 28540307 its reverse (70304582), we get a palindrome (98844889).

The spelling of 28540307 in words is "twenty-eight million, five hundred forty thousand, three hundred seven".