428856778 has 8 divisors (see below), whose sum is σ = 735183072. Its totient is φ = 183795756.

The previous prime is 428856763. The next prime is 428856787. The reversal of 428856778 is 877658824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15316300 + ... + 15316327.

It is an arithmetic number, because the mean of its divisors is an integer number (91897884).

Almost surely, 2^428856778 is an apocalyptic number.

428856778 is a deficient number, since it is larger than the sum of its proper divisors (306326294).

428856778 is a wasteful number, since it uses less digits than its factorization.

428856778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30632636.

The product of its digits is 6021120, while the sum is 55.

The square root of 428856778 is about 20708.8574769348. The cubic root of 428856778 is about 754.1147339282.

The spelling of 428856778 in words is "four hundred twenty-eight million, eight hundred fifty-six thousand, seven hundred seventy-eight".