428878656 has 84 divisors (see below), whose sum is σ = 1237695264. Its totient is φ = 141984000.

The previous prime is 428878649. The next prime is 428878661. The reversal of 428878656 is 656878824.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84511 + ... + 89441.

Almost surely, 2^428878656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 428878656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (618847632).

428878656 is an abundant number, since it is smaller than the sum of its proper divisors (808816608).

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

428878656 is a wasteful number, since it uses less digits than its factorization.

428878656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100 (or 5087 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 54.

The square root of 428878656 is about 20709.3856982770. The cubic root of 428878656 is about 754.1275573559.

It can be divided in two parts, 4288 and 78656, that added together give a square (82944 = 288²).

The spelling of 428878656 in words is "four hundred twenty-eight million, eight hundred seventy-eight thousand, six hundred fifty-six".