687506319379 has 16 divisors (see below), whose sum is σ = 762815053440. Its totient is φ = 614334951360.

The previous prime is 687506319377. The next prime is 687506319403. The reversal of 687506319379 is 973913605786.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 687506319379 - 2¹ = 687506319377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687506319379.

It is not an unprimeable number, because it can be changed into a prime (687506319373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5432527 + ... + 5557639.

It is an arithmetic number, because the mean of its divisors is an integer number (47675940840).

Almost surely, 2^687506319379 is an apocalyptic number.

687506319379 is a deficient number, since it is larger than the sum of its proper divisors (75308734061).

687506319379 is a wasteful number, since it uses less digits than its factorization.

687506319379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133650.

The product of its (nonzero) digits is 51438240, while the sum is 64.

The spelling of 687506319379 in words is "six hundred eighty-seven billion, five hundred six million, three hundred nineteen thousand, three hundred seventy-nine".