687380828072 has 16 divisors (see below), whose sum is σ = 1288874974740. Its totient is φ = 343680834816.

The previous prime is 687380828063. The next prime is 687380828081. The reversal of 687380828072 is 270828083786.

It is an interprime number because it is at equal distance from previous prime (687380828063) and next prime (687380828081).

It can be written as a sum of positive squares in 2 ways, for example, as 612378242116 + 75002585956 = 782546^2 + 273866^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887723 + ... + 1470650.

Almost surely, 2^687380828072 is an apocalyptic number.

It is an amenable number.

687380828072 is a deficient number, since it is larger than the sum of its proper divisors (601494146668).

687380828072 is a wasteful number, since it uses less digits than its factorization.

687380828072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394812 (or 2394808 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 59.

The spelling of 687380828072 in words is "six hundred eighty-seven billion, three hundred eighty million, eight hundred twenty-eight thousand, seventy-two".