687530135869 has 4 divisors (see below), whose sum is σ = 717422750496. Its totient is φ = 657637521244.

The previous prime is 687530135863. The next prime is 687530135881. The reversal of 687530135869 is 968531035786.

687530135869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 687530135869 - 2¹⁹ = 687529611581 is a prime.

It is a super-2 number, since 2×687530135869² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687530135863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14946307279 + ... + 14946307324.

It is an arithmetic number, because the mean of its divisors is an integer number (179355687624).

Almost surely, 2^687530135869 is an apocalyptic number.

It is an amenable number.

687530135869 is a deficient number, since it is larger than the sum of its proper divisors (29892614627).

687530135869 is a wasteful number, since it uses less digits than its factorization.

687530135869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29892614626.

The product of its (nonzero) digits is 32659200, while the sum is 61.

The spelling of 687530135869 in words is "six hundred eighty-seven billion, five hundred thirty million, one hundred thirty-five thousand, eight hundred sixty-nine".