7288667221 has 16 divisors (see below), whose sum is σ = 7991486208. Its totient is φ = 6592622400.

The previous prime is 7288667213. The next prime is 7288667231. The reversal of 7288667221 is 1227668827.

It is a cyclic number.

It is not a de Polignac number, because 7288667221 - 2³ = 7288667213 is a prime.

It is a super-3 number, since 3×7288667221³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7288667201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3257115 + ... + 3259351.

It is an arithmetic number, because the mean of its divisors is an integer number (499467888).

Almost surely, 2^7288667221 is an apocalyptic number.

It is an amenable number.

7288667221 is a deficient number, since it is larger than the sum of its proper divisors (702818987).

7288667221 is a wasteful number, since it uses less digits than its factorization.

7288667221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612.

The product of its digits is 903168, while the sum is 49.

The square root of 7288667221 is about 85373.6916210140. The cubic root of 7288667221 is about 1938.8730498223.

The spelling of 7288667221 in words is "seven billion, two hundred eighty-eight million, six hundred sixty-seven thousand, two hundred twenty-one".