684577 has 8 divisors (see below), whose sum is σ = 715680. Its totient is φ = 654240.

The previous prime is 684569. The next prime is 684581. The reversal of 684577 is 775486.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 684577 - 2³ = 684569 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (684527) 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, 2278 + ... + 2560.

It is an arithmetic number, because the mean of its divisors is an integer number (89460).

2⁶⁸⁴⁵⁷⁷ is an apocalyptic number.

It is an amenable number.

684577 is a deficient number, since it is larger than the sum of its proper divisors (31103).

684577 is a wasteful number, since it uses less digits than its factorization.

684577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383.

The product of its digits is 47040, while the sum is 37.

The square root of 684577 is about 827.3916847540. The cubic root of 684577 is about 88.1334493852.

Subtracting 684577 from its reverse (775486), we obtain a palindrome (90909).

The spelling of 684577 in words is "six hundred eighty-four thousand, five hundred seventy-seven".