689565780540 has 144 divisors (see below), whose sum is σ = 2574378975168. Its totient is φ = 145490798592.

The previous prime is 689565780521. The next prime is 689565780551. The reversal of 689565780540 is 45087565986.

689565780540 is a `hidden beast` number, since 6 + 8 + 9 + 5 + 6 + 5 + 7 + 80 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

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 47 ways as a sum of consecutive naturals, for example, 21032637 + ... + 21065396.

It is an arithmetic number, because the mean of its divisors is an integer number (17877631772).

Almost surely, 2^689565780540 is an apocalyptic number.

689565780540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

689565780540 is an abundant number, since it is smaller than the sum of its proper divisors (1884813194628).

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

689565780540 is a wasteful number, since it uses less digits than its factorization.

689565780540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42098068 (or 42098063 counting only the distinct ones).

The product of its (nonzero) digits is 72576000, while the sum is 63.

The spelling of 689565780540 in words is "six hundred eighty-nine billion, five hundred sixty-five million, seven hundred eighty thousand, five hundred forty".