421575028 has 36 divisors (see below), whose sum is σ = 859629540. Its totient is φ = 180375552.

The previous prime is 421575023. The next prime is 421575071. The reversal of 421575028 is 820575124.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 240188004 + 181387024 = 15498^2 + 13468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 421574984 and 421575002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421575023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149326 + ... + 152122.

Almost surely, 2^421575028 is an apocalyptic number.

It is an amenable number.

421575028 is an abundant number, since it is smaller than the sum of its proper divisors (438054512).

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

421575028 is a wasteful number, since it uses less digits than its factorization.

421575028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584 (or 3575 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 421575028 is about 20532.2923220959. The cubic root of 421575028 is about 749.8221966661.

The spelling of 421575028 in words is "four hundred twenty-one million, five hundred seventy-five thousand, twenty-eight".