1780030645 has 8 divisors (see below), whose sum is σ = 2261686104. Its totient is φ = 1340258304.

The previous prime is 1780030639. The next prime is 1780030667. The reversal of 1780030645 is 5460300871.

It can be written as a sum of positive squares in 4 ways, for example, as 413471556 + 1366559089 = 20334^2 + 36967^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1780030645 - 2²⁵ = 1746476213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1780030645.

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, 10470684 + ... + 10470853.

It is an arithmetic number, because the mean of its divisors is an integer number (282710763).

Almost surely, 2^1780030645 is an apocalyptic number.

It is an amenable number.

1780030645 is a deficient number, since it is larger than the sum of its proper divisors (481655459).

1780030645 is a wasteful number, since it uses less digits than its factorization.

1780030645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20941559.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1780030645 is about 42190.4093959753. The cubic root of 1780030645 is about 1211.9252289791.

The spelling of 1780030645 in words is "one billion, seven hundred eighty million, thirty thousand, six hundred forty-five".