697720289 has 8 divisors (see below), whose sum is σ = 797554368. Its totient is φ = 597926160.

The previous prime is 697720267. The next prime is 697720291. The reversal of 697720289 is 982027796.

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 a de Polignac number, because none of the positive numbers 2^k-697720289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697720189) 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, 64319 + ... + 74379.

It is an arithmetic number, because the mean of its divisors is an integer number (99694296).

Almost surely, 2^697720289 is an apocalyptic number.

It is an amenable number.

697720289 is a deficient number, since it is larger than the sum of its proper divisors (99834079).

697720289 is a wasteful number, since it uses less digits than its factorization.

697720289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19975.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 697720289 is about 26414.3954880667. The cubic root of 697720289 is about 886.9390656046.

The spelling of 697720289 in words is "six hundred ninety-seven million, seven hundred twenty thousand, two hundred eighty-nine".