2781390828250 has 32 divisors (see below), whose sum is σ = 5260441651920. Its totient is φ = 1101086668800.

The previous prime is 2781390828199. The next prime is 2781390828277. The reversal of 2781390828250 is 528280931872.

It can be written as a sum of positive squares in 8 ways, for example, as 287357107249 + 2494033721001 = 536057^2 + 1579251^2 .

It is a super-2 number, since 2×2781390828250² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2781390828191 and 2781390828200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57324015 + ... + 57372514.

Almost surely, 2^{2781390828250} is an apocalyptic number.

2781390828250 is a deficient number, since it is larger than the sum of its proper divisors (2479050823670).

2781390828250 is a wasteful number, since it uses less digits than its factorization.

2781390828250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114696643 (or 114696633 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 2781390828250 in words is "two trillion, seven hundred eighty-one billion, three hundred ninety million, eight hundred twenty-eight thousand, two hundred fifty".