2145456784 has 20 divisors (see below), whose sum is σ = 4203531180. Its totient is φ = 1060674560.

The previous prime is 2145456779. The next prime is 2145456793. The reversal of 2145456784 is 4876545412.

It can be written as a sum of positive squares in 2 ways, for example, as 669360384 + 1476096400 = 25872^2 + 38420^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751897 + ... + 754744.

It is an arithmetic number, because the mean of its divisors is an integer number (210176559).

Almost surely, 2^2145456784 is an apocalyptic number.

It is an amenable number.

2145456784 is a deficient number, since it is larger than the sum of its proper divisors (2058074396).

2145456784 is a wasteful number, since it uses less digits than its factorization.

2145456784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506738 (or 1506732 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 46.

The square root of 2145456784 is about 46319.0758111601. The cubic root of 2145456784 is about 1289.7531294509.

The spelling of 2145456784 in words is "two billion, one hundred forty-five million, four hundred fifty-six thousand, seven hundred eighty-four".