420705628 has 24 divisors (see below), whose sum is σ = 847560672. Its totient is φ = 178984704.

The previous prime is 420705617. The next prime is 420705631. The reversal of 420705628 is 826507024.

It is a junction number, because it is equal to n+sod(n) for n = 420705593 and 420705602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51001 + ... + 58672.

It is an arithmetic number, because the mean of its divisors is an integer number (35315028).

Almost surely, 2^420705628 is an apocalyptic number.

It is an amenable number.

420705628 is an abundant number, since it is smaller than the sum of its proper divisors (426855044).

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

420705628 is a wasteful number, since it uses less digits than its factorization.

420705628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109821 (or 109819 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 420705628 is about 20511.1098675815. The cubic root of 420705628 is about 749.3063975668.

The spelling of 420705628 in words is "four hundred twenty million, seven hundred five thousand, six hundred twenty-eight".