428987813 has 2 divisors, whose sum is σ = 428987814. Its totient is φ = 428987812.

The previous prime is 428987803. The next prime is 428987849. The reversal of 428987813 is 318789824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313360804 + 115627009 = 17702^2 + 10753^2 .

It is a cyclic number.

It is not a de Polignac number, because 428987813 - 2¹⁴ = 428971429 is a prime.

It is a Sophie Germain prime.

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 (428987803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214493906 + 214493907.

It is an arithmetic number, because the mean of its divisors is an integer number (214493907).

Almost surely, 2^428987813 is an apocalyptic number.

It is an amenable number.

428987813 is a deficient number, since it is larger than the sum of its proper divisors (1).

428987813 is an equidigital number, since it uses as much as digits as its factorization.

428987813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 50.

The square root of 428987813 is about 20712.0209781663. The cubic root of 428987813 is about 754.1915314099.

The spelling of 428987813 in words is "four hundred twenty-eight million, nine hundred eighty-seven thousand, eight hundred thirteen".