28569240 has 128 divisors (see below), whose sum is σ = 108864000. Its totient is φ = 6528384.

The previous prime is 28569239. The next prime is 28569241. The reversal of 28569240 is 4296582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28569239) and next prime (28569241).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28569195 and 28569204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28569241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5671 + ... + 9449.

It is an arithmetic number, because the mean of its divisors is an integer number (850500).

Almost surely, 2^28569240 is an apocalyptic number.

28569240 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 28569240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54432000).

28569240 is an abundant number, since it is smaller than the sum of its proper divisors (80294760).

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

28569240 is a wasteful number, since it uses less digits than its factorization.

28569240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806 (or 3796 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 28569240 is about 5345.0201122166. The cubic root of 28569240 is about 305.7029027201.

The spelling of 28569240 in words is "twenty-eight million, five hundred sixty-nine thousand, two hundred forty".