428491644 has 96 divisors (see below), whose sum is σ = 1176215040. Its totient is φ = 118879488.

The previous prime is 428491631. The next prime is 428491673. The reversal of 428491644 is 446194824.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 428491596 and 428491605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 484827 + ... + 485709.

It is an arithmetic number, because the mean of its divisors is an integer number (12252240).

Almost surely, 2^428491644 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 428491644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (588107520).

428491644 is an abundant number, since it is smaller than the sum of its proper divisors (747723396).

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

428491644 is a wasteful number, since it uses less digits than its factorization.

428491644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059 (or 1057 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The square root of 428491644 is about 20700.0397101068. The cubic root of 428491644 is about 753.9006522684.

The spelling of 428491644 in words is "four hundred twenty-eight million, four hundred ninety-one thousand, six hundred forty-four".