684765505 has 8 divisors (see below), whose sum is σ = 835646400. Its totient is φ = 538527216.

The previous prime is 684765503. The next prime is 684765511. The reversal of 684765505 is 505567486.

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 684765505 - 2¹ = 684765503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684765503) 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 7 ways as a sum of consecutive naturals, for example, 1160325 + ... + 1160914.

It is an arithmetic number, because the mean of its divisors is an integer number (104455800).

Almost surely, 2^684765505 is an apocalyptic number.

It is an amenable number.

684765505 is a deficient number, since it is larger than the sum of its proper divisors (150880895).

684765505 is a wasteful number, since it uses less digits than its factorization.

684765505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2321303.

The product of its (nonzero) digits is 1008000, while the sum is 46.

The square root of 684765505 is about 26168.0244764484. The cubic root of 684765505 is about 881.4153811306.

The spelling of 684765505 in words is "six hundred eighty-four million, seven hundred sixty-five thousand, five hundred five".