428915778 has 8 divisors (see below), whose sum is σ = 857831568. Its totient is φ = 142971924.

The previous prime is 428915777. The next prime is 428915789. The reversal of 428915778 is 877519824.

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

428915778 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 428915778.

It is not an unprimeable number, because it can be changed into a prime (428915777) 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, 35742976 + ... + 35742987.

It is an arithmetic number, because the mean of its divisors is an integer number (107228946).

Almost surely, 2^428915778 is an apocalyptic number.

428915778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

428915778 is a wasteful number, since it uses less digits than its factorization.

428915778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71485968.

The product of its digits is 1128960, while the sum is 51.

The square root of 428915778 is about 20710.2819391721. The cubic root of 428915778 is about 754.1493148041.

The spelling of 428915778 in words is "four hundred twenty-eight million, nine hundred fifteen thousand, seven hundred seventy-eight".