421745664 has 176 divisors, whose sum is σ = 1207369728. Its totient is φ = 130572288.

The previous prime is 421745657. The next prime is 421745683. The reversal of 421745664 is 466547124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3320769 + ... + 3320895.

Almost surely, 2^421745664 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 421745664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (603684864).

421745664 is an abundant number, since it is smaller than the sum of its proper divisors (785624064).

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

421745664 is a wasteful number, since it uses less digits than its factorization.

421745664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 202 counting only the distinct ones).

The product of its digits is 161280, while the sum is 39.

The square root of 421745664 is about 20536.4472097780. The cubic root of 421745664 is about 749.9233486108.

The spelling of 421745664 in words is "four hundred twenty-one million, seven hundred forty-five thousand, six hundred sixty-four".