678552617 has 4 divisors (see below), whose sum is σ = 688680336. Its totient is φ = 668424900.

The previous prime is 678552607. The next prime is 678552697. The reversal of 678552617 is 716255876.

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 a de Polignac number, because none of the positive numbers 2^k-678552617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678552607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5063759 + ... + 5063892.

It is an arithmetic number, because the mean of its divisors is an integer number (172170084).

Almost surely, 2^678552617 is an apocalyptic number.

678552617 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

678552617 is a deficient number, since it is larger than the sum of its proper divisors (10127719).

678552617 is a wasteful number, since it uses less digits than its factorization.

678552617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10127718.

The product of its digits is 705600, while the sum is 47.

The square root of 678552617 is about 26049.0425351874. The cubic root of 678552617 is about 878.7415798177.

The spelling of 678552617 in words is "six hundred seventy-eight million, five hundred fifty-two thousand, six hundred seventeen".