689956988 has 24 divisors (see below), whose sum is σ = 1381572192. Its totient is φ = 295340544.

The previous prime is 689956963. The next prime is 689956997. The reversal of 689956988 is 889659986.

It is a congruent number.

It is an unprimeable number.

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, 9620 + ... + 38372.

It is an arithmetic number, because the mean of its divisors is an integer number (57565508).

Almost surely, 2^689956988 is an apocalyptic number.

It is an amenable number.

689956988 is an abundant number, since it is smaller than the sum of its proper divisors (691615204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689956988 is a wasteful number, since it uses less digits than its factorization.

689956988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29621 (or 29619 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 68.

The square root of 689956988 is about 26267.0323409402. The cubic root of 689956988 is about 883.6372306055.

The spelling of 689956988 in words is "six hundred eighty-nine million, nine hundred fifty-six thousand, nine hundred eighty-eight".