6720228529 has 21 divisors (see below), whose sum is σ = 7873198777. Its totient is φ = 5736094644.

The previous prime is 6720228521. The next prime is 6720228539. The reversal of 6720228529 is 9258220276.

The square root of 6720228529 is 81977.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 6720228529 - 2³ = 6720228521 is a prime.

It is a super-2 number, since 2×6720228529² = 90322942963971007682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6720228521) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 28117992 + ... + 28118230.

Almost surely, 2^6720228529 is an apocalyptic number.

6720228529 is the 81977-th square number.

6720228529 is the 40989-th centered octagonal number.

It is an amenable number.

6720228529 is a deficient number, since it is larger than the sum of its proper divisors (1152970248).

6720228529 is an frugal number, since it uses more digits than its factorization.

6720228529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The cubic root of 6720228529 is about 1887.0989833502.

The spelling of 6720228529 in words is "six billion, seven hundred twenty million, two hundred twenty-eight thousand, five hundred twenty-nine".