428974778623 has 2 divisors, whose sum is σ = 428974778624. Its totient is φ = 428974778622.

The previous prime is 428974778611. The next prime is 428974778633. The reversal of 428974778623 is 326877479824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428974778623 - 2³³ = 420384844031 is a prime.

It is a super-2 number, since 2×428974778623² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428974778633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214487389311 + 214487389312.

It is an arithmetic number, because the mean of its divisors is an integer number (214487389312).

Almost surely, 2^428974778623 is an apocalyptic number.

428974778623 is a deficient number, since it is larger than the sum of its proper divisors (1).

428974778623 is an equidigital number, since it uses as much as digits as its factorization.

428974778623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 227598336, while the sum is 67.

The spelling of 428974778623 in words is "four hundred twenty-eight billion, nine hundred seventy-four million, seven hundred seventy-eight thousand, six hundred twenty-three".