1778730625 has 45 divisors (see below), whose sum is σ = 2596364991. Its totient is φ = 1214640000.

The previous prime is 1778730571. The next prime is 1778730661. The reversal of 1778730625 is 5260378771.

The square root of 1778730625 is 42175.

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

It can be written as a sum of positive squares in 7 ways, for example, as 924220801 + 854509824 = 30401^2 + 29232^2 .

It is not a de Polignac number, because 1778730625 - 2⁷ = 1778730497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 7380505 + ... + 7380745.

Almost surely, 2^1778730625 is an apocalyptic number.

1778730625 is the 42175-th square number.

1778730625 is the 21088-th centered octagonal number.

It is an amenable number.

1778730625 is a deficient number, since it is larger than the sum of its proper divisors (817634366).

1778730625 is an frugal number, since it uses more digits than its factorization.

1778730625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 46.

The cubic root of 1778730625 is about 1211.6301196878.

The spelling of 1778730625 in words is "one billion, seven hundred seventy-eight million, seven hundred thirty thousand, six hundred twenty-five".