203840028 has 144 divisors (see below), whose sum is σ = 612131520. Its totient is φ = 55987200.

The previous prime is 203840027. The next prime is 203840071. The reversal of 203840028 is 820048302.

203840028 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 203839983 and 203840010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203840027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1126098 + ... + 1126278.

Almost surely, 2^203840028 is an apocalyptic number.

203840028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203840028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306065760).

203840028 is an abundant number, since it is smaller than the sum of its proper divisors (408291492).

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

203840028 is a wasteful number, since it uses less digits than its factorization.

203840028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 203840028 is about 14277.2556186404. The cubic root of 203840028 is about 588.5226160207.

The spelling of 203840028 in words is "two hundred three million, eight hundred forty thousand, twenty-eight".