8073780781 has 16 divisors (see below), whose sum is σ = 9266698368. Its totient is φ = 7020652320.

The previous prime is 8073780733. The next prime is 8073780791. The reversal of 8073780781 is 1870873708.

It is not a de Polignac number, because 8073780781 - 2⁷ = 8073780653 is a prime.

It is a super-3 number, since 3×8073780781³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8073780791) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 101256 + ... + 162481.

It is an arithmetic number, because the mean of its divisors is an integer number (579168648).

Almost surely, 2^8073780781 is an apocalyptic number.

It is an amenable number.

8073780781 is a deficient number, since it is larger than the sum of its proper divisors (1192917587).

8073780781 is a wasteful number, since it uses less digits than its factorization.

8073780781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263793 (or 263771 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 49.

The square root of 8073780781 is about 89854.2196059818. The cubic root of 8073780781 is about 2006.1295932681.

The spelling of 8073780781 in words is "eight billion, seventy-three million, seven hundred eighty thousand, seven hundred eighty-one".