720966409 has 4 divisors (see below), whose sum is σ = 721132416. Its totient is φ = 720800404.

The previous prime is 720966397. The next prime is 720966443. The reversal of 720966409 is 904669027.

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 720966409 - 2²¹ = 718869257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720966479) 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, 76309 + ... + 85234.

It is an arithmetic number, because the mean of its divisors is an integer number (180283104).

Almost surely, 2^720966409 is an apocalyptic number.

It is an amenable number.

720966409 is a deficient number, since it is larger than the sum of its proper divisors (166007).

720966409 is a wasteful number, since it uses less digits than its factorization.

720966409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166006.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 720966409 is about 26850.8176598032. The cubic root of 720966409 is about 896.6817765005.

The spelling of 720966409 in words is "seven hundred twenty million, nine hundred sixty-six thousand, four hundred nine".