428778648 has 24 divisors (see below), whose sum is σ = 1161275700. Its totient is φ = 142926192.

The previous prime is 428778599. The next prime is 428778661. The reversal of 428778648 is 846877824.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×428778648² = 367702257961415808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 428778594 and 428778603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2977558 + ... + 2977701.

Almost surely, 2^428778648 is an apocalyptic number.

It is an amenable number.

428778648 is an abundant number, since it is smaller than the sum of its proper divisors (732497052).

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

428778648 is a wasteful number, since it uses less digits than its factorization.

428778648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5955271 (or 5955264 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 54.

The square root of 428778648 is about 20706.9710001246. The cubic root of 428778648 is about 754.0689357616.

The spelling of 428778648 in words is "four hundred twenty-eight million, seven hundred seventy-eight thousand, six hundred forty-eight".