420630028 has 24 divisors (see below), whose sum is σ = 905973152. Its totient is φ = 166402944.

The previous prime is 420629987. The next prime is 420630043. The reversal of 420630028 is 820036024.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 420629984 and 420630011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577425 + ... + 578152.

Almost surely, 2^420630028 is an apocalyptic number.

It is an amenable number.

420630028 is an abundant number, since it is smaller than the sum of its proper divisors (485343124).

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

420630028 is a wasteful number, since it uses less digits than its factorization.

420630028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155601 (or 1155599 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 420630028 is about 20509.2668810955. The cubic root of 420630028 is about 749.2615119006.

The spelling of 420630028 in words is "four hundred twenty million, six hundred thirty thousand, twenty-eight".