687838541 has 8 divisors (see below), whose sum is σ = 740964504. Its totient is φ = 634743360.

The previous prime is 687838531. The next prime is 687838573. The reversal of 687838541 is 145838786.

It can be written as a sum of positive squares in 4 ways, for example, as 34269316 + 653569225 = 5854^2 + 25565^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687838541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687838541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687838531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62471 + ... + 72651.

It is an arithmetic number, because the mean of its divisors is an integer number (92620563).

Almost surely, 2^687838541 is an apocalyptic number.

It is an amenable number.

687838541 is a deficient number, since it is larger than the sum of its proper divisors (53125963).

687838541 is a wasteful number, since it uses less digits than its factorization.

687838541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15391.

The product of its digits is 1290240, while the sum is 50.

The square root of 687838541 is about 26226.6761332808. The cubic root of 687838541 is about 882.7319288659.

The spelling of 687838541 in words is "six hundred eighty-seven million, eight hundred thirty-eight thousand, five hundred forty-one".