8261319620 has 12 divisors (see below), whose sum is σ = 17348771244. Its totient is φ = 3304527840.

The previous prime is 8261319601. The next prime is 8261319629. The reversal of 8261319620 is 269131628.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4843046464 + 3418273156 = 69592^2 + 58466^2 .

It is not an unprimeable number, because it can be changed into a prime (8261319629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206532971 + ... + 206533010.

It is an arithmetic number, because the mean of its divisors is an integer number (1445730937).

Almost surely, 2^8261319620 is an apocalyptic number.

It is an amenable number.

8261319620 is an abundant number, since it is smaller than the sum of its proper divisors (9087451624).

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

8261319620 is a wasteful number, since it uses less digits than its factorization.

8261319620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413065990 (or 413065988 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 8261319620 is about 90891.8017205072. The cubic root of 8261319620 is about 2021.5437354686.

The spelling of 8261319620 in words is "eight billion, two hundred sixty-one million, three hundred nineteen thousand, six hundred twenty".