6729920749 has 4 divisors (see below), whose sum is σ = 6761816320. Its totient is φ = 6698025180.

The previous prime is 6729920723. The next prime is 6729920753. The reversal of 6729920749 is 9470299276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6729920749 - 2⁷ = 6729920621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6729920749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6729924749) 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, 15947469 + ... + 15947890.

It is an arithmetic number, because the mean of its divisors is an integer number (1690454080).

Almost surely, 2^6729920749 is an apocalyptic number.

It is an amenable number.

6729920749 is a deficient number, since it is larger than the sum of its proper divisors (31895571).

6729920749 is a wasteful number, since it uses less digits than its factorization.

6729920749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31895570.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The square root of 6729920749 is about 82036.0941842065. The cubic root of 6729920749 is about 1888.0057676205.

The spelling of 6729920749 in words is "six billion, seven hundred twenty-nine million, nine hundred twenty thousand, seven hundred forty-nine".