28343040 has 216 divisors, whose sum is σ = 101128944. Its totient is φ = 6758400.

The previous prime is 28343023. The next prime is 28343047. The reversal of 28343040 is 4034382.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28343040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28343047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 464610 + ... + 464670.

Almost surely, 2^28343040 is an apocalyptic number.

28343040 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 28343040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50564472).

28343040 is an abundant number, since it is smaller than the sum of its proper divisors (72785904).

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

28343040 is a wasteful number, since it uses less digits than its factorization.

28343040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 28343040 is about 5323.8181787135. The cubic root of 28343040 is about 304.8939522027.

The spelling of 28343040 in words is "twenty-eight million, three hundred forty-three thousand, forty".