678349321 has 16 divisors (see below), whose sum is σ = 736815744. Its totient is φ = 620809344.

The previous prime is 678349277. The next prime is 678349333. The reversal of 678349321 is 123943876.

It is a cyclic number.

It is not a de Polignac number, because 678349321 - 2⁷ = 678349193 is a prime.

It is a super-2 number, since 2×678349321² = 920315602602322082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678349921) 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 15 ways as a sum of consecutive naturals, for example, 1348356 + ... + 1348858.

It is an arithmetic number, because the mean of its divisors is an integer number (46050984).

Almost surely, 2^678349321 is an apocalyptic number.

It is an amenable number.

678349321 is a deficient number, since it is larger than the sum of its proper divisors (58466423).

678349321 is a wasteful number, since it uses less digits than its factorization.

678349321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200.

The product of its digits is 217728, while the sum is 43.

The square root of 678349321 is about 26045.1400648950. The cubic root of 678349321 is about 878.6538133535.

The spelling of 678349321 in words is "six hundred seventy-eight million, three hundred forty-nine thousand, three hundred twenty-one".