28055851381 has 2 divisors, whose sum is σ = 28055851382. Its totient is φ = 28055851380.

The previous prime is 28055851331. The next prime is 28055851429. The reversal of 28055851381 is 18315855082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27182116900 + 873734481 = 164870^2 + 29559^2 .

It is a cyclic number.

It is not a de Polignac number, because 28055851381 - 2⁷ = 28055851253 is a prime.

It is a super-2 number, since 2×28055851381² (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 (28055851331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14027925690 + 14027925691.

It is an arithmetic number, because the mean of its divisors is an integer number (14027925691).

Almost surely, 2^28055851381 is an apocalyptic number.

It is an amenable number.

28055851381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28055851381 is an equidigital number, since it uses as much as digits as its factorization.

28055851381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384000, while the sum is 46.

The spelling of 28055851381 in words is "twenty-eight billion, fifty-five million, eight hundred fifty-one thousand, three hundred eighty-one".