687087444 has 24 divisors (see below), whose sum is σ = 1609449408. Its totient is φ = 228136960.

The previous prime is 687087439. The next prime is 687087449. The reversal of 687087444 is 444780786.

It is a happy number.

687087444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (687087439) and next prime (687087449).

It is a junction number, because it is equal to n+sod(n) for n = 687087393 and 687087402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687087449) 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, 108312 + ... + 114479.

It is an arithmetic number, because the mean of its divisors is an integer number (67060392).

Almost surely, 2^687087444 is an apocalyptic number.

It is an amenable number.

687087444 is an abundant number, since it is smaller than the sum of its proper divisors (922361964).

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

687087444 is a wasteful number, since it uses less digits than its factorization.

687087444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223055 (or 223053 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 48.

The square root of 687087444 is about 26212.3528894298. The cubic root of 687087444 is about 882.4105071263.

The spelling of 687087444 in words is "six hundred eighty-seven million, eighty-seven thousand, four hundred forty-four".