687534007540 has 24 divisors (see below), whose sum is σ = 1443844662120. Its totient is φ = 275009175168.

The previous prime is 687534007529. The next prime is 687534007561. The reversal of 687534007540 is 45700435786.

It can be written as a sum of positive squares in 4 ways, for example, as 192759633936 + 494774373604 = 439044^2 + 703402^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1184766 + ... + 1666954.

It is an arithmetic number, because the mean of its divisors is an integer number (60160194255).

Almost surely, 2^687534007540 is an apocalyptic number.

It is an amenable number.

687534007540 is an abundant number, since it is smaller than the sum of its proper divisors (756310654580).

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

687534007540 is a wasteful number, since it uses less digits than its factorization.

687534007540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553491 (or 553489 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 49.

The spelling of 687534007540 in words is "six hundred eighty-seven billion, five hundred thirty-four million, seven thousand, five hundred forty".