420668604 has 72 divisors (see below), whose sum is σ = 1128713040. Its totient is φ = 131645952.

The previous prime is 420668561. The next prime is 420668609. The reversal of 420668604 is 406866024.

It is a happy number.

420668604 is a `hidden beast` number, since 42 + 0 + 6 + 6 + 8 + 604 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420668609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 392982 + ... + 394050.

It is an arithmetic number, because the mean of its divisors is an integer number (15676570).

Almost surely, 2^420668604 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 420668604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (564356520).

420668604 is an abundant number, since it is smaller than the sum of its proper divisors (708044436).

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

420668604 is a wasteful number, since it uses less digits than its factorization.

420668604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739 (or 1734 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 420668604 is about 20510.2073124579. The cubic root of 420668604 is about 749.2844161368.

The spelling of 420668604 in words is "four hundred twenty million, six hundred sixty-eight thousand, six hundred four".