6871321520 has 40 divisors (see below), whose sum is σ = 18258084384. Its totient is φ = 2355881472.

The previous prime is 6871321517. The next prime is 6871321573. The reversal of 6871321520 is 251231786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×6871321520² = 94430118862430220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6134549 + ... + 6135668.

Almost surely, 2^6871321520 is an apocalyptic number.

It is an amenable number.

6871321520 is an abundant number, since it is smaller than the sum of its proper divisors (11386762864).

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

6871321520 is a wasteful number, since it uses less digits than its factorization.

6871321520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12270237 (or 12270231 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 6871321520 is about 82893.4347219368. The cubic root of 6871321520 is about 1901.1370405560.

The spelling of 6871321520 in words is "six billion, eight hundred seventy-one million, three hundred twenty-one thousand, five hundred twenty".