28778419499 has 2 divisors, whose sum is σ = 28778419500. Its totient is φ = 28778419498.

The previous prime is 28778419487. The next prime is 28778419517. The reversal of 28778419499 is 99491487782.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28778419499 is a prime.

It is a super-2 number, since 2×28778419499² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28778419399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14389209749 + 14389209750.

It is an arithmetic number, because the mean of its divisors is an integer number (14389209750).

Almost surely, 2^28778419499 is an apocalyptic number.

28778419499 is a deficient number, since it is larger than the sum of its proper divisors (1).

28778419499 is an equidigital number, since it uses as much as digits as its factorization.

28778419499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73156608, while the sum is 68.

The spelling of 28778419499 in words is "twenty-eight billion, seven hundred seventy-eight million, four hundred nineteen thousand, four hundred ninety-nine".