428761309 has 2 divisors, whose sum is σ = 428761310. Its totient is φ = 428761308.

The previous prime is 428761283. The next prime is 428761343. The reversal of 428761309 is 903167824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392158809 + 36602500 = 19803^2 + 6050^2 .

It is a cyclic number.

It is not a de Polignac number, because 428761309 - 2⁹ = 428760797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428761379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214380654 + 214380655.

It is an arithmetic number, because the mean of its divisors is an integer number (214380655).

Almost surely, 2^428761309 is an apocalyptic number.

It is an amenable number.

428761309 is a deficient number, since it is larger than the sum of its proper divisors (1).

428761309 is an equidigital number, since it uses as much as digits as its factorization.

428761309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 428761309 is about 20706.5523204613. The cubic root of 428761309 is about 754.0587712493.

The spelling of 428761309 in words is "four hundred twenty-eight million, seven hundred sixty-one thousand, three hundred nine".