2780193681 has 12 divisors (see below), whose sum is σ = 4109227408. Its totient is φ = 1810358424.

The previous prime is 2780193673. The next prime is 2780193683. The reversal of 2780193681 is 1863910872.

2780193681 is a `hidden beast` number, since 278 + 0 + 19 + 368 + 1 = 666.

2780193681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2780193681 - 2³ = 2780193673 is a prime.

It is a super-2 number, since 2×2780193681² = 15458953807744659522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2780193683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3591595 + ... + 3592368.

Almost surely, 2^2780193681 is an apocalyptic number.

It is an amenable number.

2780193681 is a deficient number, since it is larger than the sum of its proper divisors (1329033727).

2780193681 is a wasteful number, since it uses less digits than its factorization.

2780193681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7184012 (or 7184009 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 2780193681 is about 52727.5419586387. The cubic root of 2780193681 is about 1406.1285210856.

The spelling of 2780193681 in words is "two billion, seven hundred eighty million, one hundred ninety-three thousand, six hundred eighty-one".