2730736721 has 4 divisors (see below), whose sum is σ = 2757248832. Its totient is φ = 2704224612.

The previous prime is 2730736717. The next prime is 2730736759. The reversal of 2730736721 is 1276370372.

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 2730736721 - 2² = 2730736717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2730736781) 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, 13255901 + ... + 13256106.

It is an arithmetic number, because the mean of its divisors is an integer number (689312208).

Almost surely, 2^2730736721 is an apocalyptic number.

It is an amenable number.

2730736721 is a deficient number, since it is larger than the sum of its proper divisors (26512111).

2730736721 is a wasteful number, since it uses less digits than its factorization.

2730736721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26512110.

The product of its (nonzero) digits is 74088, while the sum is 38.

The square root of 2730736721 is about 52256.4514773057. The cubic root of 2730736721 is about 1397.7406962292.

The spelling of 2730736721 in words is "two billion, seven hundred thirty million, seven hundred thirty-six thousand, seven hundred twenty-one".