428177681 has 2 divisors, whose sum is σ = 428177682. Its totient is φ = 428177680.

The previous prime is 428177587. The next prime is 428177689. The reversal of 428177681 is 186771824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 300849025 + 127328656 = 17345^2 + 11284^2 .

It is a cyclic number.

It is not a de Polignac number, because 428177681 - 2¹⁴ = 428161297 is a prime.

It is a super-2 number, since 2×428177681² = 366672253013075522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (428177689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214088840 + 214088841.

It is an arithmetic number, because the mean of its divisors is an integer number (214088841).

Almost surely, 2^428177681 is an apocalyptic number.

It is an amenable number.

428177681 is a deficient number, since it is larger than the sum of its proper divisors (1).

428177681 is an equidigital number, since it uses as much as digits as its factorization.

428177681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150528, while the sum is 44.

The square root of 428177681 is about 20692.4546876392. The cubic root of 428177681 is about 753.7164754022.

The spelling of 428177681 in words is "four hundred twenty-eight million, one hundred seventy-seven thousand, six hundred eighty-one".