28247040 has 132 divisors (see below), whose sum is σ = 98034924. Its totient is φ = 7520256.

The previous prime is 28247033. The next prime is 28247069. The reversal of 28247040 is 4074282.

It can be written as a sum of positive squares in 2 ways, for example, as 3326976 + 24920064 = 1824^2 + 4992^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28246995 and 28247013.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45774 + ... + 46386.

Almost surely, 2^28247040 is an apocalyptic number.

28247040 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 28247040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49017462).

28247040 is an abundant number, since it is smaller than the sum of its proper divisors (69787884).

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

28247040 is a wasteful number, since it uses less digits than its factorization.

28247040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 28247040 is about 5314.7944456959. The cubic root of 28247040 is about 304.5493299358.

The spelling of 28247040 in words is "twenty-eight million, two hundred forty-seven thousand, forty".