6729520857 has 8 divisors (see below), whose sum is σ = 8982356640. Its totient is φ = 4481516160.

The previous prime is 6729520801. The next prime is 6729520877. The reversal of 6729520857 is 7580259276.

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

It is not a de Polignac number, because 6729520857 - 2²⁸ = 6461085401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6729520877) 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, 1204519 + ... + 1210092.

It is an arithmetic number, because the mean of its divisors is an integer number (1122794580).

Almost surely, 2^6729520857 is an apocalyptic number.

It is an amenable number.

6729520857 is a deficient number, since it is larger than the sum of its proper divisors (2252835783).

6729520857 is a wasteful number, since it uses less digits than its factorization.

6729520857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415543.

The product of its (nonzero) digits is 2116800, while the sum is 51.

The square root of 6729520857 is about 82033.6568549763. The cubic root of 6729520857 is about 1887.9683717687.

The spelling of 6729520857 in words is "six billion, seven hundred twenty-nine million, five hundred twenty thousand, eight hundred fifty-seven".