6875221720 has 16 divisors (see below), whose sum is σ = 15469248960. Its totient is φ = 2750088672.

The previous prime is 6875221699. The next prime is 6875221723. The reversal of 6875221720 is 271225786.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 171880543 = 6875221720 / (6 + 8 + 7 + 5 + 2 + 2 + 1 + 7 + 2 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6875221723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85940232 + ... + 85940311.

It is an arithmetic number, because the mean of its divisors is an integer number (966828060).

Almost surely, 2^6875221720 is an apocalyptic number.

It is an amenable number.

6875221720 is an abundant number, since it is smaller than the sum of its proper divisors (8594027240).

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

6875221720 is a wasteful number, since it uses less digits than its factorization.

6875221720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171880554 (or 171880550 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 6875221720 is about 82916.9567700118. The cubic root of 6875221720 is about 1901.4966711457.

The spelling of 6875221720 in words is "six billion, eight hundred seventy-five million, two hundred twenty-one thousand, seven hundred twenty".