28508713 has 2 divisors, whose sum is σ = 28508714. Its totient is φ = 28508712.

The previous prime is 28508693. The next prime is 28508723. The reversal of 28508713 is 31780582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22924944 + 5583769 = 4788^2 + 2363^2 .

It is a cyclic number.

It is not a de Polignac number, because 28508713 - 2⁵ = 28508681 is a prime.

It is not a weakly prime, because it can be changed into another prime (28508723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14254356 + 14254357.

It is an arithmetic number, because the mean of its divisors is an integer number (14254357).

Almost surely, 2^28508713 is an apocalyptic number.

It is an amenable number.

28508713 is a deficient number, since it is larger than the sum of its proper divisors (1).

28508713 is an equidigital number, since it uses as much as digits as its factorization.

28508713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 28508713 is about 5339.3551108725. The cubic root of 28508713 is about 305.4868619474.

The spelling of 28508713 in words is "twenty-eight million, five hundred eight thousand, seven hundred thirteen".