687521885 has 16 divisors (see below), whose sum is σ = 835660800. Its totient is φ = 542948736.

The previous prime is 687521869. The next prime is 687521893. The reversal of 687521885 is 588125786.

687521885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 687521885 - 2⁴ = 687521869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461612 + ... + 463098.

It is an arithmetic number, because the mean of its divisors is an integer number (52228800).

Almost surely, 2^687521885 is an apocalyptic number.

It is an amenable number.

687521885 is a deficient number, since it is larger than the sum of its proper divisors (148138915).

687521885 is a wasteful number, since it uses less digits than its factorization.

687521885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620.

The product of its digits is 1075200, while the sum is 50.

The square root of 687521885 is about 26220.6385315080. The cubic root of 687521885 is about 882.5964487835.

The spelling of 687521885 in words is "six hundred eighty-seven million, five hundred twenty-one thousand, eight hundred eighty-five".