1677728881 has 2 divisors, whose sum is σ = 1677728882. Its totient is φ = 1677728880.

The previous prime is 1677728867. The next prime is 1677728953. The reversal of 1677728881 is 1888277761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1657792656 + 19936225 = 40716^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1677728881 - 2⁷ = 1677728753 is a prime.

It is a super-2 number, since 2×1677728881² = 5629548396283024322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1677728831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 838864440 + 838864441.

It is an arithmetic number, because the mean of its divisors is an integer number (838864441).

Almost surely, 2^1677728881 is an apocalyptic number.

It is an amenable number.

1677728881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1677728881 is an equidigital number, since it uses as much as digits as its factorization.

1677728881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2107392, while the sum is 55.

The square root of 1677728881 is about 40960.0888792981. The cubic root of 1677728881 is about 1188.2484603257.

The spelling of 1677728881 in words is "one billion, six hundred seventy-seven million, seven hundred twenty-eight thousand, eight hundred eighty-one".