6687647280 has 160 divisors (see below), whose sum is σ = 23217561600. Its totient is φ = 1769257728.

The previous prime is 6687647269. The next prime is 6687647297. The reversal of 6687647280 is 827467866.

It is a super-2 number, since 2×6687647280² = 89449252283382796800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 262131 + ... + 286509.

It is an arithmetic number, because the mean of its divisors is an integer number (145109760).

Almost surely, 2^6687647280 is an apocalyptic number.

6687647280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6687647280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11608780800).

6687647280 is an abundant number, since it is smaller than the sum of its proper divisors (16529914320).

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

6687647280 is a wasteful number, since it uses less digits than its factorization.

6687647280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24528 (or 24516 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 54.

The square root of 6687647280 is about 81778.0366602182. The cubic root of 6687647280 is about 1884.0443415261.

The spelling of 6687647280 in words is "six billion, six hundred eighty-seven million, six hundred forty-seven thousand, two hundred eighty".