8261720052 has 12 divisors (see below), whose sum is σ = 19277346816. Its totient is φ = 2753906680.

The previous prime is 8261720023. The next prime is 8261720053. The reversal of 8261720052 is 2500271628.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 8261719995 and 8261720022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8261720053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344238324 + ... + 344238347.

It is an arithmetic number, because the mean of its divisors is an integer number (1606445568).

Almost surely, 2^8261720052 is an apocalyptic number.

It is an amenable number.

8261720052 is an abundant number, since it is smaller than the sum of its proper divisors (11015626764).

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

8261720052 is a wasteful number, since it uses less digits than its factorization.

8261720052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688476678 (or 688476676 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 8261720052 is about 90894.0044887450. The cubic root of 8261720052 is about 2021.5763968254.

The spelling of 8261720052 in words is "eight billion, two hundred sixty-one million, seven hundred twenty thousand, fifty-two".