709690721 has 8 divisors (see below), whose sum is σ = 751730400. Its totient is φ = 667683648.

The previous prime is 709690699. The next prime is 709690759. The reversal of 709690721 is 127096907.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 709690721 - 2¹⁰ = 709689697 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (709690021) 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, 47630 + ... + 60728.

It is an arithmetic number, because the mean of its divisors is an integer number (93966300).

Almost surely, 2^709690721 is an apocalyptic number.

It is an amenable number.

709690721 is a deficient number, since it is larger than the sum of its proper divisors (42039679).

709690721 is a wasteful number, since it uses less digits than its factorization.

709690721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16303.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 709690721 is about 26640.0210397815. The cubic root of 709690721 is about 891.9825856930.

The spelling of 709690721 in words is "seven hundred nine million, six hundred ninety thousand, seven hundred twenty-one".