8021561260 has 12 divisors (see below), whose sum is σ = 16845278688. Its totient is φ = 3208624496.

The previous prime is 8021561243. The next prime is 8021561263. The reversal of 8021561260 is 621651208.

It is not an unprimeable number, because it can be changed into a prime (8021561263) 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, 200539012 + ... + 200539051.

It is an arithmetic number, because the mean of its divisors is an integer number (1403773224).

Almost surely, 2^8021561260 is an apocalyptic number.

It is an amenable number.

8021561260 is an abundant number, since it is smaller than the sum of its proper divisors (8823717428).

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

8021561260 is a wasteful number, since it uses less digits than its factorization.

8021561260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401078072 (or 401078070 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 8021561260 is about 89563.1691042696. The cubic root of 8021561260 is about 2001.7951598851.

The spelling of 8021561260 in words is "eight billion, twenty-one million, five hundred sixty-one thousand, two hundred sixty".