428480861 has 2 divisors, whose sum is σ = 428480862. Its totient is φ = 428480860.

The previous prime is 428480851. The next prime is 428480863. The reversal of 428480861 is 168084824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347822500 + 80658361 = 18650^2 + 8981^2 .

It is a cyclic number.

It is not a de Polignac number, because 428480861 - 2¹⁰ = 428479837 is a prime.

It is a Sophie Germain prime.

Together with 428480863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428480863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214240430 + 214240431.

It is an arithmetic number, because the mean of its divisors is an integer number (214240431).

Almost surely, 2^428480861 is an apocalyptic number.

It is an amenable number.

428480861 is a deficient number, since it is larger than the sum of its proper divisors (1).

428480861 is an equidigital number, since it uses as much as digits as its factorization.

428480861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98304, while the sum is 41.

The square root of 428480861 is about 20699.7792500307. The cubic root of 428480861 is about 753.8943282408.

The spelling of 428480861 in words is "four hundred twenty-eight million, four hundred eighty thousand, eight hundred sixty-one".