8278945813 has 4 divisors (see below), whose sum is σ = 8279281120. Its totient is φ = 8278610508.

The previous prime is 8278945783. The next prime is 8278945817. The reversal of 8278945813 is 3185498728.

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 a de Polignac number, because none of the positive numbers 2^k-8278945813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8278945817) 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, 127395 + ... + 181072.

It is an arithmetic number, because the mean of its divisors is an integer number (2069820280).

Almost surely, 2^8278945813 is an apocalyptic number.

It is an amenable number.

8278945813 is a deficient number, since it is larger than the sum of its proper divisors (335307).

8278945813 is a wasteful number, since it uses less digits than its factorization.

8278945813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335306.

The product of its digits is 3870720, while the sum is 55.

The square root of 8278945813 is about 90988.7125582069. The cubic root of 8278945813 is about 2022.9804231625.

It can be divided in two parts, 82 and 78945813, that added together give a triangular number (78945895 = T₁₂₅₆₅).

The spelling of 8278945813 in words is "eight billion, two hundred seventy-eight million, nine hundred forty-five thousand, eight hundred thirteen".