8172078820 has 24 divisors (see below), whose sum is σ = 17172099000. Its totient is φ = 3266787072.

The previous prime is 8172078797. The next prime is 8172078821. The reversal of 8172078820 is 288702718.

It can be written as a sum of positive squares in 4 ways, for example, as 1309281856 + 6862796964 = 36184^2 + 82842^2 .

It is not an unprimeable number, because it can be changed into a prime (8172078821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94795 + ... + 159154.

It is an arithmetic number, because the mean of its divisors is an integer number (715504125).

Almost surely, 2^8172078820 is an apocalyptic number.

It is an amenable number.

8172078820 is an abundant number, since it is smaller than the sum of its proper divisors (9000020180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8172078820 is a wasteful number, since it uses less digits than its factorization.

8172078820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255567 (or 255565 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 43.

The square root of 8172078820 is about 90399.5509944601. The cubic root of 8172078820 is about 2014.2382965789.

The spelling of 8172078820 in words is "eight billion, one hundred seventy-two million, seventy-eight thousand, eight hundred twenty".