28751669909 has 2 divisors, whose sum is σ = 28751669910. Its totient is φ = 28751669908.

The previous prime is 28751669893. The next prime is 28751669971. The reversal of 28751669909 is 90996615782.

It is an a-pointer prime, because the next prime (28751669971) can be obtained adding 28751669909 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23354563684 + 5397106225 = 152822^2 + 73465^2 .

It is a cyclic number.

It is not a de Polignac number, because 28751669909 - 2⁴ = 28751669893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28751663909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14375834954 + 14375834955.

It is an arithmetic number, because the mean of its divisors is an integer number (14375834955).

Almost surely, 2^28751669909 is an apocalyptic number.

It is an amenable number.

28751669909 is a deficient number, since it is larger than the sum of its proper divisors (1).

28751669909 is an equidigital number, since it uses as much as digits as its factorization.

28751669909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14696640, while the sum is 62.

The spelling of 28751669909 in words is "twenty-eight billion, seven hundred fifty-one million, six hundred sixty-nine thousand, nine hundred nine".