421002728028 has 54 divisors (see below), whose sum is σ = 1110520212984. Its totient is φ = 134226800928.

The previous prime is 421002727993. The next prime is 421002728071. The reversal of 421002728028 is 820827200124.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 421002727983 and 421002728001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18659298 + ... + 18681846.

Almost surely, 2^421002728028 is an apocalyptic number.

It is an amenable number.

421002728028 is an abundant number, since it is smaller than the sum of its proper divisors (689517484956).

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

421002728028 is an equidigital number, since it uses as much as digits as its factorization.

421002728028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45131 (or 22577 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The spelling of 421002728028 in words is "four hundred twenty-one billion, two million, seven hundred twenty-eight thousand, twenty-eight".