421532028 has 18 divisors (see below), whose sum is σ = 1065539384. Its totient is φ = 140510664.

The previous prime is 421532011. The next prime is 421532039. The reversal of 421532028 is 820235124.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 421531992 and 421532010.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 5854576 + ... + 5854647.

Almost surely, 2^421532028 is an apocalyptic number.

It is an amenable number.

421532028 is an abundant number, since it is smaller than the sum of its proper divisors (644007356).

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

421532028 is a wasteful number, since it uses less digits than its factorization.

421532028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11709233 (or 11709228 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 421532028 is about 20531.2451643830. The cubic root of 421532028 is about 749.7967022317.

The spelling of 421532028 in words is "four hundred twenty-one million, five hundred thirty-two thousand, twenty-eight".