8076406781 has 4 divisors (see below), whose sum is σ = 8336936064. Its totient is φ = 7815877500.

The previous prime is 8076406777. The next prime is 8076406787. The reversal of 8076406781 is 1876046708.

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 8076406781 - 2² = 8076406777 is a prime.

It is a super-2 number, since 2×8076406781² (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 (8076406787) 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, 130264595 + ... + 130264656.

It is an arithmetic number, because the mean of its divisors is an integer number (2084234016).

Almost surely, 2^8076406781 is an apocalyptic number.

It is an amenable number.

8076406781 is a deficient number, since it is larger than the sum of its proper divisors (260529283).

8076406781 is a wasteful number, since it uses less digits than its factorization.

8076406781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260529282.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 8076406781 is about 89868.8309760397. The cubic root of 8076406781 is about 2006.3470678073.

The spelling of 8076406781 in words is "eight billion, seventy-six million, four hundred six thousand, seven hundred eighty-one".