28506878453 has 2 divisors, whose sum is σ = 28506878454. Its totient is φ = 28506878452.

The previous prime is 28506878441. The next prime is 28506878473. The reversal of 28506878453 is 35487860582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16057451524 + 12449426929 = 126718^2 + 111577^2 .

It is a cyclic number.

It is not a de Polignac number, because 28506878453 - 2¹⁸ = 28506616309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28506878473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14253439226 + 14253439227.

It is an arithmetic number, because the mean of its divisors is an integer number (14253439227).

Almost surely, 2^28506878453 is an apocalyptic number.

It is an amenable number.

28506878453 is a deficient number, since it is larger than the sum of its proper divisors (1).

28506878453 is an equidigital number, since it uses as much as digits as its factorization.

28506878453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12902400, while the sum is 56.

The spelling of 28506878453 in words is "twenty-eight billion, five hundred six million, eight hundred seventy-eight thousand, four hundred fifty-three".