8261538520 has 32 divisors (see below), whose sum is σ = 18592322400. Its totient is φ = 3303929088.

The previous prime is 8261538497. The next prime is 8261538557. The reversal of 8261538520 is 258351628.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202396 + ... + 239764.

It is an arithmetic number, because the mean of its divisors is an integer number (581010075).

Almost surely, 2^8261538520 is an apocalyptic number.

It is an amenable number.

8261538520 is an abundant number, since it is smaller than the sum of its proper divisors (10330783880).

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

8261538520 is a wasteful number, since it uses less digits than its factorization.

8261538520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42907 (or 42903 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 8261538520 is about 90893.0058915426. The cubic root of 8261538520 is about 2021.5615902439.

The spelling of 8261538520 in words is "eight billion, two hundred sixty-one million, five hundred thirty-eight thousand, five hundred twenty".