428783865949 has 2 divisors, whose sum is σ = 428783865950. Its totient is φ = 428783865948.

The previous prime is 428783865869. The next prime is 428783865953. The reversal of 428783865949 is 949568387824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239358713049 + 189425152900 = 489243^2 + 435230^2 .

It is a cyclic number.

It is not a de Polignac number, because 428783865949 - 2⁷ = 428783865821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428783865989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214391932974 + 214391932975.

It is an arithmetic number, because the mean of its divisors is an integer number (214391932975).

Almost surely, 2^428783865949 is an apocalyptic number.

It is an amenable number.

428783865949 is a deficient number, since it is larger than the sum of its proper divisors (1).

428783865949 is an equidigital number, since it uses as much as digits as its factorization.

428783865949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 836075520, while the sum is 73.

The spelling of 428783865949 in words is "four hundred twenty-eight billion, seven hundred eighty-three million, eight hundred sixty-five thousand, nine hundred forty-nine".