8449728 has 56 divisors (see below), whose sum is σ = 25554432. Its totient is φ = 2413824.

The previous prime is 8449723. The next prime is 8449729. The reversal of 8449728 is 8279448.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a d-powerful number, because it can be written as 8 + 4⁵ + 4⁵ + 9⁵ + 7 + 2²³ + 8 .

It is a self number, because there is not a number n which added to its sum of digits gives 8449728.

It is not an unprimeable number, because it can be changed into a prime (8449723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1800 + ... + 4487.

Almost surely, 2^8449728 is an apocalyptic number.

It is an amenable number.

8449728 is an abundant number, since it is smaller than the sum of its proper divisors (17104704).

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

8449728 is a wasteful number, since it uses less digits than its factorization.

8449728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6309 (or 6299 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 8449728 is about 2906.8415849509. The cubic root of 8449728 is about 203.6796201398.

The spelling of 8449728 in words is "eight million, four hundred forty-nine thousand, seven hundred twenty-eight".