706764721 has 4 divisors (see below), whose sum is σ = 761131252. Its totient is φ = 652398192.

The previous prime is 706764719. The next prime is 706764733. The reversal of 706764721 is 127467607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127467607 = 683 ⋅186629.

It can be written as a sum of positive squares in 2 ways, for example, as 152868496 + 553896225 = 12364^2 + 23535^2 .

It is a cyclic number.

It is not a de Polignac number, because 706764721 - 2¹ = 706764719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (706764701) 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, 27183246 + ... + 27183271.

It is an arithmetic number, because the mean of its divisors is an integer number (190282813).

Almost surely, 2^706764721 is an apocalyptic number.

It is an amenable number.

706764721 is a deficient number, since it is larger than the sum of its proper divisors (54366531).

706764721 is a wasteful number, since it uses less digits than its factorization.

706764721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54366530.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 706764721 is about 26585.0469437238. The cubic root of 706764721 is about 890.7550386933.

The spelling of 706764721 in words is "seven hundred six million, seven hundred sixty-four thousand, seven hundred twenty-one".