28013020 has 48 divisors (see below), whose sum is σ = 68177088. Its totient is φ = 9469440.

The previous prime is 28013009. The next prime is 28013053. The reversal of 28013020 is 2031082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28012985 and 28013003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8850 + ... + 11590.

It is an arithmetic number, because the mean of its divisors is an integer number (1420356).

Almost surely, 2^28013020 is an apocalyptic number.

28013020 is a gapful number since it is divisible by the number (20) 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 28013020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34088544).

28013020 is an abundant number, since it is smaller than the sum of its proper divisors (40164068).

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

28013020 is a wasteful number, since it uses less digits than its factorization.

28013020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830 (or 2828 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 28013020 is about 5292.7327535027. The cubic root of 28013020 is about 303.7059570231.

The spelling of 28013020 in words is "twenty-eight million, thirteen thousand, twenty".