1820244378208 has 48 divisors (see below), whose sum is σ = 3633017569776. Its totient is φ = 897575454720.

The previous prime is 1820244378191. The next prime is 1820244378233. The reversal of 1820244378208 is 8028734420281.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 33333135 + ... + 33387697.

It is an arithmetic number, because the mean of its divisors is an integer number (75687866037).

Almost surely, 2^{1820244378208} is an apocalyptic number.

It is an amenable number.

1820244378208 is a deficient number, since it is larger than the sum of its proper divisors (1812773191568).

1820244378208 is a wasteful number, since it uses less digits than its factorization.

1820244378208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68927 (or 68919 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 49.

Adding to 1820244378208 its reverse (8028734420281), we get a palindrome (9848978798489).

The spelling of 1820244378208 in words is "one trillion, eight hundred twenty billion, two hundred forty-four million, three hundred seventy-eight thousand, two hundred eight".