684319473 has 6 divisors (see below), whose sum is σ = 988461474. Its totient is φ = 456212976.

The previous prime is 684319457. The next prime is 684319507. The reversal of 684319473 is 374913486.

684319473 is a `hidden beast` number, since 68 + 431 + 94 + 73 = 666.

684319473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 508412304 + 175907169 = 22548^2 + 13263^2 .

It is not a de Polignac number, because 684319473 - 2⁴ = 684319457 is a prime.

It is a super-2 number, since 2×684319473² = 936586282253995458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (684319423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38017740 + ... + 38017757.

It is an arithmetic number, because the mean of its divisors is an integer number (164743579).

Almost surely, 2^684319473 is an apocalyptic number.

It is an amenable number.

684319473 is a deficient number, since it is larger than the sum of its proper divisors (304142001).

684319473 is a wasteful number, since it uses less digits than its factorization.

684319473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76035503 (or 76035500 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 684319473 is about 26159.5006259676. The cubic root of 684319473 is about 881.2239653090.

The spelling of 684319473 in words is "six hundred eighty-four million, three hundred nineteen thousand, four hundred seventy-three".