684164641 has 4 divisors (see below), whose sum is σ = 688756500. Its totient is φ = 679572784.

The previous prime is 684164639. The next prime is 684164653. The reversal of 684164641 is 146461486.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101425041 + 582739600 = 10071^2 + 24140^2 .

It is a cyclic number.

It is not a de Polignac number, because 684164641 - 2¹ = 684164639 is a prime.

It is a super-3 number, since 3×684164641³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684164594 and 684164603.

It is not an unprimeable number, because it can be changed into a prime (684161641) 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, 2295706 + ... + 2296003.

It is an arithmetic number, because the mean of its divisors is an integer number (172189125).

Almost surely, 2^684164641 is an apocalyptic number.

It is an amenable number.

684164641 is a deficient number, since it is larger than the sum of its proper divisors (4591859).

684164641 is a wasteful number, since it uses less digits than its factorization.

684164641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591858.

The product of its digits is 110592, while the sum is 40.

The square root of 684164641 is about 26156.5410748440. The cubic root of 684164641 is about 881.1574992962.

The spelling of 684164641 in words is "six hundred eighty-four million, one hundred sixty-four thousand, six hundred forty-one".