28947663751 has 2 divisors, whose sum is σ = 28947663752. Its totient is φ = 28947663750.

The previous prime is 28947663721. The next prime is 28947663763. The reversal of 28947663751 is 15736674982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28947663751 - 2⁷ = 28947663623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28947663721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14473831875 + 14473831876.

It is an arithmetic number, because the mean of its divisors is an integer number (14473831876).

Almost surely, 2^28947663751 is an apocalyptic number.

28947663751 is a deficient number, since it is larger than the sum of its proper divisors (1).

28947663751 is an equidigital number, since it uses as much as digits as its factorization.

28947663751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15240960, while the sum is 58.

The spelling of 28947663751 in words is "twenty-eight billion, nine hundred forty-seven million, six hundred sixty-three thousand, seven hundred fifty-one".