689628831 has 8 divisors (see below), whose sum is σ = 922444080. Its totient is φ = 458283072.

The previous prime is 689628827. The next prime is 689628839. The reversal of 689628831 is 138826986.

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

It is not a de Polignac number, because 689628831 - 2² = 689628827 is a prime.

It is a super-3 number, since 3×689628831³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689628839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366276 + ... + 368153.

It is an arithmetic number, because the mean of its divisors is an integer number (115305510).

Almost surely, 2^689628831 is an apocalyptic number.

689628831 is a deficient number, since it is larger than the sum of its proper divisors (232815249).

689628831 is a wasteful number, since it uses less digits than its factorization.

689628831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734745.

The product of its digits is 995328, while the sum is 51.

The square root of 689628831 is about 26260.7850415786. The cubic root of 689628831 is about 883.4971166893.

The spelling of 689628831 in words is "six hundred eighty-nine million, six hundred twenty-eight thousand, eight hundred thirty-one".