428326819 has 2 divisors, whose sum is σ = 428326820. Its totient is φ = 428326818.

The previous prime is 428326757. The next prime is 428326831. The reversal of 428326819 is 918623824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428326819 - 2⁹ = 428326307 is a prime.

It is a super-2 number, since 2×428326819² = 366927727749317522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (428326879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214163409 + 214163410.

It is an arithmetic number, because the mean of its divisors is an integer number (214163410).

Almost surely, 2^428326819 is an apocalyptic number.

428326819 is a deficient number, since it is larger than the sum of its proper divisors (1).

428326819 is an equidigital number, since it uses as much as digits as its factorization.

428326819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 428326819 is about 20696.0580546151. The cubic root of 428326819 is about 753.8039739060.

The spelling of 428326819 in words is "four hundred twenty-eight million, three hundred twenty-six thousand, eight hundred nineteen".