428663779 has 4 divisors (see below), whose sum is σ = 430178776. Its totient is φ = 427148784.

The previous prime is 428663771. The next prime is 428663791. The reversal of 428663779 is 977366824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428663779 - 2³ = 428663771 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (428663771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757074 + ... + 757639.

It is an arithmetic number, because the mean of its divisors is an integer number (107544694).

Almost surely, 2^428663779 is an apocalyptic number.

428663779 is a deficient number, since it is larger than the sum of its proper divisors (1514997).

428663779 is a wasteful number, since it uses less digits than its factorization.

428663779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514996.

The product of its digits is 3048192, while the sum is 52.

The square root of 428663779 is about 20704.1971348806. The cubic root of 428663779 is about 754.0015918604.

The spelling of 428663779 in words is "four hundred twenty-eight million, six hundred sixty-three thousand, seven hundred seventy-nine".