6640739229 has 8 divisors (see below), whose sum is σ = 9320335840. Its totient is φ = 4194151056.

The previous prime is 6640739221. The next prime is 6640739293. The reversal of 6640739229 is 9229370466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6640739229 - 2³ = 6640739221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640739221) 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, 58252042 + ... + 58252155.

It is an arithmetic number, because the mean of its divisors is an integer number (1165041980).

Almost surely, 2^6640739229 is an apocalyptic number.

It is an amenable number.

6640739229 is a deficient number, since it is larger than the sum of its proper divisors (2679596611).

6640739229 is a wasteful number, since it uses less digits than its factorization.

6640739229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116504219.

The product of its (nonzero) digits is 979776, while the sum is 48.

The square root of 6640739229 is about 81490.7309391688. The cubic root of 6640739229 is about 1879.6290226394.

The spelling of 6640739229 in words is "six billion, six hundred forty million, seven hundred thirty-nine thousand, two hundred twenty-nine".