28447040 has 28 divisors (see below), whose sum is σ = 67740276. Its totient is φ = 11378688.

The previous prime is 28447039. The next prime is 28447049. The reversal of 28447040 is 4074482.

It can be written as a sum of positive squares in 2 ways, for example, as 7139584 + 21307456 = 2672^2 + 4616^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28446994 and 28447012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28447049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44129 + ... + 44768.

Almost surely, 2^28447040 is an apocalyptic number.

28447040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28447040 is an abundant number, since it is smaller than the sum of its proper divisors (39293236).

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

28447040 is an equidigital number, since it uses as much as digits as its factorization.

28447040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88914 (or 88904 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 28447040 is about 5333.5766611159. The cubic root of 28447040 is about 305.2664159696.

The spelling of 28447040 in words is "twenty-eight million, four hundred forty-seven thousand, forty".