6687111280 has 40 divisors (see below), whose sum is σ = 15616067472. Its totient is φ = 2663053824.

The previous prime is 6687111253. The next prime is 6687111289. The reversal of 6687111280 is 821117866.

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

It is a super-2 number, since 2×6687111280² = 89434914542206476800, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687111289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165957 + ... + 202276.

Almost surely, 2^6687111280 is an apocalyptic number.

It is an amenable number.

6687111280 is an abundant number, since it is smaller than the sum of its proper divisors (8928956192).

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

6687111280 is a wasteful number, since it uses less digits than its factorization.

6687111280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368473 (or 368467 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 6687111280 is about 81774.7594310127. The cubic root of 6687111280 is about 1883.9940061986.

The spelling of 6687111280 in words is "six billion, six hundred eighty-seven million, one hundred eleven thousand, two hundred eighty".