687738744936 has 128 divisors (see below), whose sum is σ = 1915448832000. Its totient is φ = 228639547584.

The previous prime is 687738744919. The next prime is 687738744961. The reversal of 687738744936 is 639447837786.

It is a happy number.

687738744936 is a `hidden beast` number, since 6 + 8 + 7 + 73 + 87 + 449 + 36 = 666.

It is a super-2 number, since 2×687738744936² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 147486141 + ... + 147490803.

It is an arithmetic number, because the mean of its divisors is an integer number (14964444000).

Almost surely, 2^687738744936 is an apocalyptic number.

It is an amenable number.

687738744936 is an abundant number, since it is smaller than the sum of its proper divisors (1227710087064).

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

687738744936 is a wasteful number, since it uses less digits than its factorization.

687738744936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6340 (or 6330 counting only the distinct ones).

The product of its digits is 1024192512, while the sum is 72.

The spelling of 687738744936 in words is "six hundred eighty-seven billion, seven hundred thirty-eight million, seven hundred forty-four thousand, nine hundred thirty-six".