8078557781 has 8 divisors (see below), whose sum is σ = 9317341440. Its totient is φ = 6860950128.

The previous prime is 8078557771. The next prime is 8078557787. The reversal of 8078557781 is 1877558708.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8078557781 - 2⁶ = 8078557717 is a prime.

It is a super-2 number, since 2×8078557781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8078557787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5293181 + ... + 5294706.

It is an arithmetic number, because the mean of its divisors is an integer number (1164667680).

Almost surely, 2^8078557781 is an apocalyptic number.

It is an amenable number.

8078557781 is a deficient number, since it is larger than the sum of its proper divisors (1238783659).

8078557781 is a wasteful number, since it uses less digits than its factorization.

8078557781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10588003.

The product of its (nonzero) digits is 4390400, while the sum is 56.

The square root of 8078557781 is about 89880.7976210714. The cubic root of 8078557781 is about 2006.5251696780.

The spelling of 8078557781 in words is "eight billion, seventy-eight million, five hundred fifty-seven thousand, seven hundred eighty-one".