684057601 has 4 divisors (see below), whose sum is σ = 684122692. Its totient is φ = 683992512.

The previous prime is 684057593. The next prime is 684057613. The reversal of 684057601 is 106750486.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 106750486 = 2 ⋅53375243.

It can be written as a sum of positive squares in 2 ways, for example, as 373416976 + 310640625 = 19324^2 + 17625^2 .

It is a cyclic number.

It is not a de Polignac number, because 684057601 - 2³ = 684057593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684057641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12780 + ... + 39133.

It is an arithmetic number, because the mean of its divisors is an integer number (171030673).

Almost surely, 2^684057601 is an apocalyptic number.

It is an amenable number.

684057601 is a deficient number, since it is larger than the sum of its proper divisors (65091).

684057601 is a wasteful number, since it uses less digits than its factorization.

684057601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65090.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 684057601 is about 26154.4948527017. The cubic root of 684057601 is about 881.1115434876. Note that the first 3 decimals are identical.

The spelling of 684057601 in words is "six hundred eighty-four million, fifty-seven thousand, six hundred one".