28984340 has 144 divisors (see below), whose sum is σ = 80438400. Its totient is φ = 8574720.

The previous prime is 28984339. The next prime is 28984381. The reversal of 28984340 is 4348982.

It is a junction number, because it is equal to n+sod(n) for n = 28984294 and 28984303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 491231 + ... + 491289.

It is an arithmetic number, because the mean of its divisors is an integer number (558600).

Almost surely, 2^28984340 is an apocalyptic number.

28984340 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 28984340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40219200).

28984340 is an abundant number, since it is smaller than the sum of its proper divisors (51454060).

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

28984340 is a wasteful number, since it uses less digits than its factorization.

28984340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 28984340 is about 5383.7106162943. The cubic root of 28984340 is about 307.1763709084.

The spelling of 28984340 in words is "twenty-eight million, nine hundred eighty-four thousand, three hundred forty".