28761821047 has 2 divisors, whose sum is σ = 28761821048. Its totient is φ = 28761821046.

The previous prime is 28761821029. The next prime is 28761821063. The reversal of 28761821047 is 74012816782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28761821047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28761820988 and 28761821006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28761821447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14380910523 + 14380910524.

It is an arithmetic number, because the mean of its divisors is an integer number (14380910524).

Almost surely, 2^28761821047 is an apocalyptic number.

28761821047 is a deficient number, since it is larger than the sum of its proper divisors (1).

28761821047 is an equidigital number, since it uses as much as digits as its factorization.

28761821047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 28761821047 in words is "twenty-eight billion, seven hundred sixty-one million, eight hundred twenty-one thousand, forty-seven".