687897544005 has 256 divisors, whose sum is σ = 1532230041600. Its totient is φ = 285728808960.

The previous prime is 687897543997. The next prime is 687897544007. The reversal of 687897544005 is 500445798786.

687897544005 is a `hidden beast` number, since 6 + 8 + 7 + 89 + 7 + 544 + 0 + 0 + 5 = 666.

It is not a de Polignac number, because 687897544005 - 2³ = 687897543997 is a prime.

It is a super-2 number, since 2×687897544005² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687897544007) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 62890897 + ... + 62901833.

It is an arithmetic number, because the mean of its divisors is an integer number (5985273600).

Almost surely, 2^687897544005 is an apocalyptic number.

It is an amenable number.

687897544005 is an abundant number, since it is smaller than the sum of its proper divisors (844332497595).

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

687897544005 is a wasteful number, since it uses less digits than its factorization.

687897544005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11121 (or 11115 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 63.

The spelling of 687897544005 in words is "six hundred eighty-seven billion, eight hundred ninety-seven million, five hundred forty-four thousand, five".