687568820 has 48 divisors (see below), whose sum is σ = 1475072256. Its totient is φ = 269136000.

The previous prime is 687568799. The next prime is 687568829. The reversal of 687568820 is 28865786.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687568829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256085 + ... + 258755.

It is an arithmetic number, because the mean of its divisors is an integer number (30730672).

Almost surely, 2^687568820 is an apocalyptic number.

It is an amenable number.

687568820 is an abundant number, since it is smaller than the sum of its proper divisors (787503436).

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

687568820 is a wasteful number, since it uses less digits than its factorization.

687568820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952 (or 2950 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The square root of 687568820 is about 26221.5335173212. The cubic root of 687568820 is about 882.6165323729.

The spelling of 687568820 in words is "six hundred eighty-seven million, five hundred sixty-eight thousand, eight hundred twenty".