684945465 has 32 divisors (see below), whose sum is σ = 1144958976. Its totient is φ = 349241280.

The previous prime is 684945389. The next prime is 684945479. The reversal of 684945465 is 564549486.

It is not a de Polignac number, because 684945465 - 2¹⁰ = 684944441 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29722 + ... + 47468.

It is an arithmetic number, because the mean of its divisors is an integer number (35779968).

Almost surely, 2^684945465 is an apocalyptic number.

It is an amenable number.

684945465 is a deficient number, since it is larger than the sum of its proper divisors (460013511).

684945465 is a wasteful number, since it uses less digits than its factorization.

684945465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17869.

The product of its digits is 4147200, while the sum is 51.

The square root of 684945465 is about 26171.4627982465. The cubic root of 684945465 is about 881.4925879104.

The spelling of 684945465 in words is "six hundred eighty-four million, nine hundred forty-five thousand, four hundred sixty-five".