28530407 has 2 divisors, whose sum is σ = 28530408. Its totient is φ = 28530406.

The previous prime is 28530391. The next prime is 28530413. The reversal of 28530407 is 70403582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28530407 - 2⁴ = 28530391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28530407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28530497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265203 + 14265204.

It is an arithmetic number, because the mean of its divisors is an integer number (14265204).

Almost surely, 2^28530407 is an apocalyptic number.

28530407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28530407 is an equidigital number, since it uses as much as digits as its factorization.

28530407 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 28530407 is about 5341.3862432893. The cubic root of 28530407 is about 305.5643300964.

Adding to 28530407 its reverse (70403582), we get a palindrome (98933989).

The spelling of 28530407 in words is "twenty-eight million, five hundred thirty thousand, four hundred seven".