421428928 has 56 divisors (see below), whose sum is σ = 878281200. Its totient is φ = 200352768.

The previous prime is 421428923. The next prime is 421428937. The reversal of 421428928 is 829824124.

It is not an unprimeable number, because it can be changed into a prime (421428923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122658 + ... + 126046.

Almost surely, 2^421428928 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 421428928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (439140600).

421428928 is an abundant number, since it is smaller than the sum of its proper divisors (456852272).

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

421428928 is a wasteful number, since it uses less digits than its factorization.

421428928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497 (or 3487 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 421428928 is about 20528.7342035499. The cubic root of 421428928 is about 749.7355678155.

The spelling of 421428928 in words is "four hundred twenty-one million, four hundred twenty-eight thousand, nine hundred twenty-eight".