420128630 has 8 divisors (see below), whose sum is σ = 756231552. Its totient is φ = 168051448.

The previous prime is 420128617. The next prime is 420128663. The reversal of 420128630 is 36821024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 420128630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21006422 + ... + 21006441.

It is an arithmetic number, because the mean of its divisors is an integer number (94528944).

Almost surely, 2^420128630 is an apocalyptic number.

420128630 is a deficient number, since it is larger than the sum of its proper divisors (336102922).

420128630 is a wasteful number, since it uses less digits than its factorization.

420128630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42012870.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 420128630 is about 20497.0395423339. The cubic root of 420128630 is about 748.9636827958.

Adding to 420128630 its reverse (36821024), we get a palindrome (456949654).

The spelling of 420128630 in words is "four hundred twenty million, one hundred twenty-eight thousand, six hundred thirty".