688682417 has 4 divisors (see below), whose sum is σ = 724928880. Its totient is φ = 652435956.

The previous prime is 688682381. The next prime is 688682419. The reversal of 688682417 is 714286886.

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 688682417 - 2¹⁸ = 688420273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688682419) 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, 18123203 + ... + 18123240.

It is an arithmetic number, because the mean of its divisors is an integer number (181232220).

Almost surely, 2^688682417 is an apocalyptic number.

It is an amenable number.

688682417 is a deficient number, since it is larger than the sum of its proper divisors (36246463).

688682417 is a wasteful number, since it uses less digits than its factorization.

688682417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36246462.

The product of its digits is 1032192, while the sum is 50.

The square root of 688682417 is about 26242.7593251929. The cubic root of 688682417 is about 883.0927751102.

The spelling of 688682417 in words is "six hundred eighty-eight million, six hundred eighty-two thousand, four hundred seventeen".