428555868 has 96 divisors (see below), whose sum is σ = 1141002240. Its totient is φ = 124104960.

The previous prime is 428555861. The next prime is 428555899. The reversal of 428555868 is 868555824.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 428555868.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428555861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 565746 + ... + 566502.

It is an arithmetic number, because the mean of its divisors is an integer number (11885440).

Almost surely, 2^428555868 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 428555868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (570501120).

428555868 is an abundant number, since it is smaller than the sum of its proper divisors (712446372).

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

428555868 is a wasteful number, since it uses less digits than its factorization.

428555868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 985 counting only the distinct ones).

The product of its digits is 3072000, while the sum is 51.

The square root of 428555868 is about 20701.5909533543. The cubic root of 428555868 is about 753.9383162442.

The spelling of 428555868 in words is "four hundred twenty-eight million, five hundred fifty-five thousand, eight hundred sixty-eight".