678308161 has 8 divisors (see below), whose sum is σ = 698028840. Its totient is φ = 658660608.

The previous prime is 678308129. The next prime is 678308207. The reversal of 678308161 is 161803876.

It can be written as a sum of positive squares in 4 ways, for example, as 348195600 + 330112561 = 18660^2 + 18169^2 .

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 678308161 - 2⁵ = 678308129 is a prime.

It is a super-2 number, since 2×678308161² = 920203922558403842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678302161) 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, 825 + ... + 36841.

It is an arithmetic number, because the mean of its divisors is an integer number (87253605).

Almost surely, 2^678308161 is an apocalyptic number.

It is an amenable number.

678308161 is a deficient number, since it is larger than the sum of its proper divisors (19720679).

678308161 is a wasteful number, since it uses less digits than its factorization.

678308161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36563.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 678308161 is about 26044.3498862997. The cubic root of 678308161 is about 878.6360417220.

The spelling of 678308161 in words is "six hundred seventy-eight million, three hundred eight thousand, one hundred sixty-one".