687057617 has 4 divisors (see below), whose sum is σ = 687114480. Its totient is φ = 687000756.

The previous prime is 687057611. The next prime is 687057641. The reversal of 687057617 is 716750786.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 716750786 = 2 ⋅358375393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687057617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687057611) 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, 2303 + ... + 37140.

It is an arithmetic number, because the mean of its divisors is an integer number (171778620).

Almost surely, 2^687057617 is an apocalyptic number.

It is an amenable number.

687057617 is a deficient number, since it is larger than the sum of its proper divisors (56863).

687057617 is a wasteful number, since it uses less digits than its factorization.

687057617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56862.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 687057617 is about 26211.7839339485. The cubic root of 687057617 is about 882.3977382329.

The spelling of 687057617 in words is "six hundred eighty-seven million, fifty-seven thousand, six hundred seventeen".