689772689 has 8 divisors (see below), whose sum is σ = 703491432. Its totient is φ = 676131840.

The previous prime is 689772641. The next prime is 689772697. The reversal of 689772689 is 986277986.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 138462289 + 551310400 = 11767^2 + 23480^2 .

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 689772689 - 2¹² = 689768593 is a prime.

It is a super-3 number, since 3×689772689³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689772089) 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, 1424 + ... + 37169.

It is an arithmetic number, because the mean of its divisors is an integer number (87936429).

Almost surely, 2^689772689 is an apocalyptic number.

It is an amenable number.

689772689 is a deficient number, since it is larger than the sum of its proper divisors (13718743).

689772689 is a wasteful number, since it uses less digits than its factorization.

689772689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38947.

The product of its digits is 18289152, while the sum is 62.

The square root of 689772689 is about 26263.5239257796. The cubic root of 689772689 is about 883.5585455265.

The spelling of 689772689 in words is "six hundred eighty-nine million, seven hundred seventy-two thousand, six hundred eighty-nine".