28437815669 has 2 divisors, whose sum is σ = 28437815670. Its totient is φ = 28437815668.

The previous prime is 28437815597. The next prime is 28437815699. The reversal of 28437815669 is 96651873482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15490789444 + 12947026225 = 124462^2 + 113785^2 .

It is a cyclic number.

It is not a de Polignac number, because 28437815669 - 2¹² = 28437811573 is a prime.

It is a super-2 number, since 2×28437815669² (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 (28437815699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14218907834 + 14218907835.

It is an arithmetic number, because the mean of its divisors is an integer number (14218907835).

Almost surely, 2^28437815669 is an apocalyptic number.

It is an amenable number.

28437815669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28437815669 is an equidigital number, since it uses as much as digits as its factorization.

28437815669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 59.

The spelling of 28437815669 in words is "twenty-eight billion, four hundred thirty-seven million, eight hundred fifteen thousand, six hundred sixty-nine".