1447521728 has 56 divisors (see below), whose sum is σ = 3011149680. Its totient is φ = 689633280.

The previous prime is 1447521701. The next prime is 1447521731. The reversal of 1447521728 is 8271257441.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106418 + ... + 119246.

It is an arithmetic number, because the mean of its divisors is an integer number (53770530).

Almost surely, 2^1447521728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1447521728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1505574840).

1447521728 is an abundant number, since it is smaller than the sum of its proper divisors (1563627952).

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

1447521728 is a wasteful number, since it uses less digits than its factorization.

1447521728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12925 (or 12915 counting only the distinct ones).

The product of its digits is 125440, while the sum is 41.

The square root of 1447521728 is about 38046.3103073084. The cubic root of 1447521728 is about 1131.2059925780.

The spelling of 1447521728 in words is "one billion, four hundred forty-seven million, five hundred twenty-one thousand, seven hundred twenty-eight".