1428091920784 has 15 divisors (see below), whose sum is σ = 2766937358017. Its totient is φ = 714043570336.

The previous prime is 1428091920763. The next prime is 1428091920809. The reversal of 1428091920784 is 4870291908241.

The square root of 1428091920784 is 1195028.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 799128723600 + 628963197184 = 893940^2 + 793072^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4630734 + ... + 4929490.

Almost surely, 2^{1428091920784} is an apocalyptic number.

1428091920784 is the 1195028-th square number.

It is an amenable number.

1428091920784 is a deficient number, since it is larger than the sum of its proper divisors (1338845437233).

1428091920784 is an frugal number, since it uses more digits than its factorization.

1428091920784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597522 (or 298759 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 1428091920784 in words is "one trillion, four hundred twenty-eight billion, ninety-one million, nine hundred twenty thousand, seven hundred eighty-four".