28771918749 has 12 divisors (see below), whose sum is σ = 47496500896. Its totient is φ = 16441096392.

The previous prime is 28771918697. The next prime is 28771918771. The reversal of 28771918749 is 94781917782.

It is not a de Polignac number, because 28771918749 - 2⁹ = 28771918237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 456697123 = 28771918749 / (2 + 8 + 7 + 7 + 1 + 9 + 1 + 8 + 7 + 4 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28771918789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228348499 + ... + 228348624.

Almost surely, 2^28771918749 is an apocalyptic number.

It is an amenable number.

28771918749 is a deficient number, since it is larger than the sum of its proper divisors (18724582147).

28771918749 is a wasteful number, since it uses less digits than its factorization.

28771918749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456697136 (or 456697133 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 63.

The spelling of 28771918749 in words is "twenty-eight billion, seven hundred seventy-one million, nine hundred eighteen thousand, seven hundred forty-nine".