2001020028 has 48 divisors (see below), whose sum is σ = 5353281024. Its totient is φ = 569874240.

The previous prime is 2001019997. The next prime is 2001020029. The reversal of 2001020028 is 8200201002.

It is a junction number, because it is equal to n+sod(n) for n = 2001019989 and 2001020016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001020029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12175 + ... + 64422.

It is an arithmetic number, because the mean of its divisors is an integer number (111526688).

Almost surely, 2^2001020028 is an apocalyptic number.

2001020028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2001020028 is an abundant number, since it is smaller than the sum of its proper divisors (3352260996).

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

2001020028 is a wasteful number, since it uses less digits than its factorization.

2001020028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76922 (or 76920 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2001020028 is about 44732.7623560182. The cubic root of 2001020028 is about 1260.1352059496.

The spelling of 2001020028 in words is "two billion, one million, twenty thousand, twenty-eight".