687735990 has 24 divisors (see below), whose sum is σ = 1788113808. Its totient is φ = 183396240.

The previous prime is 687735977. The next prime is 687736031. The reversal of 687735990 is 99537786.

687735990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3820666 + ... + 3820845.

It is an arithmetic number, because the mean of its divisors is an integer number (74504742).

Almost surely, 2^687735990 is an apocalyptic number.

687735990 is an abundant number, since it is smaller than the sum of its proper divisors (1100377818).

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

687735990 is a wasteful number, since it uses less digits than its factorization.

687735990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7641524 (or 7641521 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The square root of 687735990 is about 26224.7209708702. The cubic root of 687735990 is about 882.6880573583.

The spelling of 687735990 in words is "six hundred eighty-seven million, seven hundred thirty-five thousand, nine hundred ninety".