684771641 has 8 divisors (see below), whose sum is σ = 706190400. Its totient is φ = 663680080.

The previous prime is 684771629. The next prime is 684771649. The reversal of 684771641 is 146177486.

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 684771641 - 2¹⁰ = 684770617 is a prime.

It is a super-3 number, since 3×684771641³ (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 = 684771592 and 684771601.

It is not an unprimeable number, because it can be changed into a prime (684771649) 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 7 ways as a sum of consecutive naturals, for example, 77546 + ... + 85923.

It is an arithmetic number, because the mean of its divisors is an integer number (88273800).

Almost surely, 2^684771641 is an apocalyptic number.

It is an amenable number.

684771641 is a deficient number, since it is larger than the sum of its proper divisors (21418759).

684771641 is a wasteful number, since it uses less digits than its factorization.

684771641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163599.

The product of its digits is 225792, while the sum is 44.

The square root of 684771641 is about 26168.1417185096. The cubic root of 684771641 is about 881.4180138317.

The spelling of 684771641 in words is "six hundred eighty-four million, seven hundred seventy-one thousand, six hundred forty-one".