28129553 has 2 divisors, whose sum is σ = 28129554. Its totient is φ = 28129552.

The previous prime is 28129537. The next prime is 28129559. The reversal of 28129553 is 35592182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28121809 + 7744 = 5303^2 + 88^2 .

It is a cyclic number.

It is not a de Polignac number, because 28129553 - 2⁴ = 28129537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28129559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14064776 + 14064777.

It is an arithmetic number, because the mean of its divisors is an integer number (14064777).

Almost surely, 2^28129553 is an apocalyptic number.

It is an amenable number.

28129553 is a deficient number, since it is larger than the sum of its proper divisors (1).

28129553 is an equidigital number, since it uses as much as digits as its factorization.

28129553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 28129553 is about 5303.7301024845. The cubic root of 28129553 is about 304.1265091247.

It can be divided in two parts, 28129 and 553, that added together give a palindrome (28682).

The spelling of 28129553 in words is "twenty-eight million, one hundred twenty-nine thousand, five hundred fifty-three".