428621872 has 80 divisors (see below), whose sum is σ = 1003935744. Its totient is φ = 173376000.

The previous prime is 428621863. The next prime is 428621873. The reversal of 428621872 is 278126824.

It is not an unprimeable number, because it can be changed into a prime (428621873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140847 + ... + 143857.

Almost surely, 2^428621872 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 428621872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (501967872).

428621872 is an abundant number, since it is smaller than the sum of its proper divisors (575313872).

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

428621872 is a wasteful number, since it uses less digits than its factorization.

428621872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3098 (or 3092 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 428621872 is about 20703.1850689695. The cubic root of 428621872 is about 753.9770201750.

The spelling of 428621872 in words is "four hundred twenty-eight million, six hundred twenty-one thousand, eight hundred seventy-two".