1788272645 has 16 divisors (see below), whose sum is σ = 2197078128. Its totient is φ = 1396861440.

The previous prime is 1788272597. The next prime is 1788272663. The reversal of 1788272645 is 5462728871.

It can be written as a sum of positive squares in 8 ways, for example, as 1435204 + 1786837441 = 1198^2 + 42271^2 .

It is not a de Polignac number, because 1788272645 - 2⁶ = 1788272581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1788272593 and 1788272602.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 20387 + ... + 63183.

It is an arithmetic number, because the mean of its divisors is an integer number (137317383).

Almost surely, 2^1788272645 is an apocalyptic number.

It is an amenable number.

1788272645 is a deficient number, since it is larger than the sum of its proper divisors (408805483).

1788272645 is a wasteful number, since it uses less digits than its factorization.

1788272645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43000.

The product of its digits is 1505280, while the sum is 50.

The square root of 1788272645 is about 42287.9728173390. The cubic root of 1788272645 is about 1213.7928579755.

The spelling of 1788272645 in words is "one billion, seven hundred eighty-eight million, two hundred seventy-two thousand, six hundred forty-five".