428777819 has 2 divisors, whose sum is σ = 428777820. Its totient is φ = 428777818.

The previous prime is 428777809. The next prime is 428777827. The reversal of 428777819 is 918777824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428777819 - 2⁸ = 428777563 is a prime.

It is a super-2 number, since 2×428777819² = 367700836132793522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428777809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214388909 + 214388910.

It is an arithmetic number, because the mean of its divisors is an integer number (214388910).

Almost surely, 2^428777819 is an apocalyptic number.

428777819 is a deficient number, since it is larger than the sum of its proper divisors (1).

428777819 is an equidigital number, since it uses as much as digits as its factorization.

428777819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 53.

The square root of 428777819 is about 20706.9509827014. The cubic root of 428777819 is about 754.0684497894.

The spelling of 428777819 in words is "four hundred twenty-eight million, seven hundred seventy-seven thousand, eight hundred nineteen".