678720361 has 8 divisors (see below), whose sum is σ = 741629664. Its totient is φ = 616012320.

The previous prime is 678720353. The next prime is 678720403. The reversal of 678720361 is 163027876.

678720361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 678720361 - 2³ = 678720353 is a prime.

It is a super-2 number, since 2×678720361² = 921322656871940642, which contains 22 as substring.

It is a Duffinian number.

678720361 is a modest number, since divided by 20361 gives 6787 as remainder.

It is not an unprimeable number, because it can be changed into a prime (678720661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43215 + ... + 56788.

It is an arithmetic number, because the mean of its divisors is an integer number (92703708).

Almost surely, 2^678720361 is an apocalyptic number.

It is an amenable number.

678720361 is a deficient number, since it is larger than the sum of its proper divisors (62909303).

678720361 is a wasteful number, since it uses less digits than its factorization.

678720361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100631.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 678720361 is about 26052.2621090761. The cubic root of 678720361 is about 878.8139846586.

The spelling of 678720361 in words is "six hundred seventy-eight million, seven hundred twenty thousand, three hundred sixty-one".