8072227781 has 4 divisors (see below), whose sum is σ = 8072424000. Its totient is φ = 8072031564.

The previous prime is 8072227777. The next prime is 8072227789. The reversal of 8072227781 is 1877222708.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8072227781 - 2² = 8072227777 is a prime.

It is a super-2 number, since 2×8072227781² (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 (8072227789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10061 + ... + 127458.

It is an arithmetic number, because the mean of its divisors is an integer number (2018106000).

Almost surely, 2^8072227781 is an apocalyptic number.

It is an amenable number.

8072227781 is a deficient number, since it is larger than the sum of its proper divisors (196219).

8072227781 is a wasteful number, since it uses less digits than its factorization.

8072227781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196218.

The product of its (nonzero) digits is 175616, while the sum is 44.

The square root of 8072227781 is about 89845.5774148066. The cubic root of 8072227781 is about 2006.0009579930. Note that the first 3 decimals are identical.

The spelling of 8072227781 in words is "eight billion, seventy-two million, two hundred twenty-seven thousand, seven hundred eighty-one".