28277414381 has 2 divisors, whose sum is σ = 28277414382. Its totient is φ = 28277414380.

The previous prime is 28277414369. The next prime is 28277414441. The reversal of 28277414381 is 18341477282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22707777481 + 5569636900 = 150691^2 + 74630^2 .

It is a cyclic number.

It is not a de Polignac number, because 28277414381 - 2¹⁸ = 28277152237 is a prime.

It is a super-2 number, since 2×28277414381² (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 (28277414881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14138707190 + 14138707191.

It is an arithmetic number, because the mean of its divisors is an integer number (14138707191).

Almost surely, 2^28277414381 is an apocalyptic number.

It is an amenable number.

28277414381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28277414381 is an equidigital number, since it uses as much as digits as its factorization.

28277414381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 47.

The spelling of 28277414381 in words is "twenty-eight billion, two hundred seventy-seven million, four hundred fourteen thousand, three hundred eighty-one".