28285740 has 144 divisors (see below), whose sum is σ = 102463200. Its totient is φ = 6459264.

The previous prime is 28285711. The next prime is 28285753. The reversal of 28285740 is 4758282.

It is a happy number.

28285740 is a `hidden beast` number, since 2 + 82 + 8 + 574 + 0 = 666.

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 = 28285695 and 28285704.

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, 25926 + ... + 26994.

It is an arithmetic number, because the mean of its divisors is an integer number (711550).

Almost surely, 2^28285740 is an apocalyptic number.

28285740 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 28285740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51231600).

28285740 is an abundant number, since it is smaller than the sum of its proper divisors (74177460).

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

28285740 is a wasteful number, since it uses less digits than its factorization.

28285740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28285740 is about 5318.4339800359. The cubic root of 28285740 is about 304.6883495834.

The spelling of 28285740 in words is "twenty-eight million, two hundred eighty-five thousand, seven hundred forty".