28916217893 has 2 divisors, whose sum is σ = 28916217894. Its totient is φ = 28916217892.

The previous prime is 28916217877. The next prime is 28916217907. The reversal of 28916217893 is 39871261982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21890090209 + 7026127684 = 147953^2 + 83822^2 .

It is a cyclic number.

It is not a de Polignac number, because 28916217893 - 2⁴ = 28916217877 is a prime.

It is a super-2 number, since 2×28916217893² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28916217853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14458108946 + 14458108947.

It is an arithmetic number, because the mean of its divisors is an integer number (14458108947).

Almost surely, 2^28916217893 is an apocalyptic number.

It is an amenable number.

28916217893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28916217893 is an equidigital number, since it uses as much as digits as its factorization.

28916217893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 56.

The spelling of 28916217893 in words is "twenty-eight billion, nine hundred sixteen million, two hundred seventeen thousand, eight hundred ninety-three".