2781978898208 has 48 divisors (see below), whose sum is σ = 5524604144640. Its totient is φ = 1378957042176.

The previous prime is 2781978898207. The next prime is 2781978898213. The reversal of 2781978898208 is 8028988791872.

It is a super-2 number, since 2×2781978898208² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2781978898207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 889916 + ... + 2521092.

It is an arithmetic number, because the mean of its divisors is an integer number (115095919680).

Almost surely, 2^{2781978898208} is an apocalyptic number.

It is an amenable number.

2781978898208 is a deficient number, since it is larger than the sum of its proper divisors (2742625246432).

2781978898208 is a wasteful number, since it uses less digits than its factorization.

2781978898208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631649 (or 1631641 counting only the distinct ones).

The product of its (nonzero) digits is 520224768, while the sum is 77.

The spelling of 2781978898208 in words is "two trillion, seven hundred eighty-one billion, nine hundred seventy-eight million, eight hundred ninety-eight thousand, two hundred eight".