687506920 has 32 divisors (see below), whose sum is σ = 1552196520. Its totient is φ = 274059520.

The previous prime is 687506873. The next prime is 687506921. The reversal of 687506920 is 29605786.

687506920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 564252516 + 123254404 = 23754^2 + 11102^2 .

It is not an unprimeable number, because it can be changed into a prime (687506921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17611 + ... + 41050.

Almost surely, 2^687506920 is an apocalyptic number.

It is an amenable number.

687506920 is an abundant number, since it is smaller than the sum of its proper divisors (864689600).

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

687506920 is a wasteful number, since it uses less digits than its factorization.

687506920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58965 (or 58961 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 687506920 is about 26220.3531631441. The cubic root of 687506920 is about 882.5900450350.

The spelling of 687506920 in words is "six hundred eighty-seven million, five hundred six thousand, nine hundred twenty".