3645780819 has 32 divisors (see below), whose sum is σ = 5202401280. Its totient is φ = 2264308992.

The previous prime is 3645780779. The next prime is 3645780851. The reversal of 3645780819 is 9180875463.

It is not a de Polignac number, because 3645780819 - 2¹¹ = 3645778771 is a prime.

It is a super-2 number, since 2×3645780819² = 26583435560376621522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3645780119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1650814 + ... + 1653020.

It is an arithmetic number, because the mean of its divisors is an integer number (162575040).

Almost surely, 2^3645780819 is an apocalyptic number.

3645780819 is a deficient number, since it is larger than the sum of its proper divisors (1556620461).

3645780819 is a wasteful number, since it uses less digits than its factorization.

3645780819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 3645780819 is about 60380.3015808964. The cubic root of 3645780819 is about 1539.0882356618.

The spelling of 3645780819 in words is "three billion, six hundred forty-five million, seven hundred eighty thousand, eight hundred nineteen".