420816664 has 8 divisors (see below), whose sum is σ = 789031260. Its totient is φ = 210408328.

The previous prime is 420816631. The next prime is 420816667. The reversal of 420816664 is 466618024.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420816667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26301034 + ... + 26301049.

Almost surely, 2^420816664 is an apocalyptic number.

It is an amenable number.

420816664 is a deficient number, since it is larger than the sum of its proper divisors (368214596).

420816664 is a wasteful number, since it uses less digits than its factorization.

420816664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52602089 (or 52602085 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 420816664 is about 20513.8164172345. The cubic root of 420816664 is about 749.3723127508.

The spelling of 420816664 in words is "four hundred twenty million, eight hundred sixteen thousand, six hundred sixty-four".