684698065 has 8 divisors (see below), whose sum is σ = 824077800. Its totient is φ = 546131712.

The previous prime is 684697999. The next prime is 684698081. The reversal of 684698065 is 560896486.

It can be written as a sum of positive squares in 4 ways, for example, as 5157441 + 679540624 = 2271^2 + 26068^2 .

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 684698065 - 2²⁹ = 147827153 is a prime.

It is a super-2 number, since 2×684698065² = 937622880429488450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201490 + ... + 204859.

It is an arithmetic number, because the mean of its divisors is an integer number (103009725).

Almost surely, 2^684698065 is an apocalyptic number.

It is an amenable number.

684698065 is a deficient number, since it is larger than the sum of its proper divisors (139379735).

684698065 is a wasteful number, since it uses less digits than its factorization.

684698065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406691.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The square root of 684698065 is about 26166.7358491654. The cubic root of 684698065 is about 881.3864444098.

The spelling of 684698065 in words is "six hundred eighty-four million, six hundred ninety-eight thousand, sixty-five".