687927990 has 16 divisors (see below), whose sum is σ = 1651027248. Its totient is φ = 183447456.

The previous prime is 687927979. The next prime is 687927991. The reversal of 687927990 is 99729786.

687927990 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 687927990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687927991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11465437 + ... + 11465496.

It is an arithmetic number, because the mean of its divisors is an integer number (103189203).

Almost surely, 2^687927990 is an apocalyptic number.

687927990 is an abundant number, since it is smaller than the sum of its proper divisors (963099258).

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

687927990 is a wasteful number, since it uses less digits than its factorization.

687927990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22930943.

The product of its (nonzero) digits is 3429216, while the sum is 57.

The square root of 687927990 is about 26228.3813835318. The cubic root of 687927990 is about 882.7701917532.

The spelling of 687927990 in words is "six hundred eighty-seven million, nine hundred twenty-seven thousand, nine hundred ninety".