28151869859989 has 2 divisors, whose sum is σ = 28151869859990. Its totient is φ = 28151869859988.

The previous prime is 28151869859959. The next prime is 28151869860041. The reversal of 28151869859989 is 98995896815182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27871451952964 + 280417907025 = 5279342^2 + 529545^2 .

It is a cyclic number.

It is not a de Polignac number, because 28151869859989 - 2²³ = 28151861471381 is a prime.

It is a super-2 number, since 2×28151869859989² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28151869859959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14075934929994 + 14075934929995.

It is an arithmetic number, because the mean of its divisors is an integer number (14075934929995).

Almost surely, 2^{28151869859989} is an apocalyptic number.

It is an amenable number.

28151869859989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28151869859989 is an equidigital number, since it uses as much as digits as its factorization.

28151869859989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8062156800, while the sum is 88.

The spelling of 28151869859989 in words is "twenty-eight trillion, one hundred fifty-one billion, eight hundred sixty-nine million, eight hundred fifty-nine thousand, nine hundred eighty-nine".