1445731728 has 40 divisors (see below), whose sum is σ = 4268351808. Its totient is φ = 413066112.

The previous prime is 1445731669. The next prime is 1445731733. The reversal of 1445731728 is 8271375441.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1445731728.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2151051 + ... + 2151722.

Almost surely, 2^1445731728 is an apocalyptic number.

It is an amenable number.

1445731728 is an abundant number, since it is smaller than the sum of its proper divisors (2822620080).

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

1445731728 is a wasteful number, since it uses less digits than its factorization.

1445731728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302791 (or 4302785 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 1445731728 is about 38022.7790672907. The cubic root of 1445731728 is about 1130.7395185335.

The spelling of 1445731728 in words is "one billion, four hundred forty-five million, seven hundred thirty-one thousand, seven hundred twenty-eight".