687978055316 has 6 divisors (see below), whose sum is σ = 1203961596810. Its totient is φ = 343989027656.

The previous prime is 687978055253. The next prime is 687978055319. The reversal of 687978055316 is 613550879786.

It can be written as a sum of positive squares in only one way, i.e., 521673952900 + 166304102416 = 722270^2 + 407804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687978055319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85997256911 + ... + 85997256918.

It is an arithmetic number, because the mean of its divisors is an integer number (200660266135).

Almost surely, 2^687978055316 is an apocalyptic number.

It is an amenable number.

687978055316 is a deficient number, since it is larger than the sum of its proper divisors (515983541494).

687978055316 is a wasteful number, since it uses less digits than its factorization.

687978055316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171994513833 (or 171994513831 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 65.

The spelling of 687978055316 in words is "six hundred eighty-seven billion, nine hundred seventy-eight million, fifty-five thousand, three hundred sixteen".