689163779840 has 36 divisors (see below), whose sum is σ = 1650762619464. Its totient is φ = 275665511424.

The previous prime is 689163779833. The next prime is 689163779849. The reversal of 689163779840 is 48977361986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689163779849) 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, 269203322 + ... + 269205881.

Almost surely, 2^689163779840 is an apocalyptic number.

It is an amenable number.

689163779840 is an abundant number, since it is smaller than the sum of its proper divisors (961598839624).

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

689163779840 is an equidigital number, since it uses as much as digits as its factorization.

689163779840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538409224 (or 538409210 counting only the distinct ones).

The product of its (nonzero) digits is 109734912, while the sum is 68.

The spelling of 689163779840 in words is "six hundred eighty-nine billion, one hundred sixty-three million, seven hundred seventy-nine thousand, eight hundred forty".