2781206721136 has 80 divisors (see below), whose sum is σ = 5608417895424. Its totient is φ = 1335016380672.

The previous prime is 2781206721101. The next prime is 2781206721191. The reversal of 2781206721136 is 6311276021872.

It is a super-2 number, since 2×2781206721136² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

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, 315934111 + ... + 315942913.

Almost surely, 2^{2781206721136} is an apocalyptic number.

It is an amenable number.

2781206721136 is an abundant number, since it is smaller than the sum of its proper divisors (2827211174288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2781206721136 is a wasteful number, since it uses less digits than its factorization.

2781206721136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16838 (or 16832 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 2781206721136 in words is "two trillion, seven hundred eighty-one billion, two hundred six million, seven hundred twenty-one thousand, one hundred thirty-six".