28728386623 has 2 divisors, whose sum is σ = 28728386624. Its totient is φ = 28728386622.

The previous prime is 28728386611. The next prime is 28728386651. The reversal of 28728386623 is 32668382782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28728386623 - 2⁹ = 28728386111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28728386653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14364193311 + 14364193312.

It is an arithmetic number, because the mean of its divisors is an integer number (14364193312).

Almost surely, 2^28728386623 is an apocalyptic number.

28728386623 is a deficient number, since it is larger than the sum of its proper divisors (1).

28728386623 is an equidigital number, since it uses as much as digits as its factorization.

28728386623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 55.

The spelling of 28728386623 in words is "twenty-eight billion, seven hundred twenty-eight million, three hundred eighty-six thousand, six hundred twenty-three".