28755613 has 2 divisors, whose sum is σ = 28755614. Its totient is φ = 28755612.

The previous prime is 28755581. The next prime is 28755641. The reversal of 28755613 is 31655782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24581764 + 4173849 = 4958^2 + 2043^2 .

It is a cyclic number.

It is not a de Polignac number, because 28755613 - 2⁵ = 28755581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28755413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14377806 + 14377807.

It is an arithmetic number, because the mean of its divisors is an integer number (14377807).

Almost surely, 2^28755613 is an apocalyptic number.

It is an amenable number.

28755613 is a deficient number, since it is larger than the sum of its proper divisors (1).

28755613 is an equidigital number, since it uses as much as digits as its factorization.

28755613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 28755613 is about 5362.4260367860. The cubic root of 28755613 is about 306.3662189475.

The spelling of 28755613 in words is "twenty-eight million, seven hundred fifty-five thousand, six hundred thirteen".