678143849 has 8 divisors (see below), whose sum is σ = 688753800. Its totient is φ = 667614976.

The previous prime is 678143833. The next prime is 678143861. The reversal of 678143849 is 948341876.

It can be written as a sum of positive squares in 4 ways, for example, as 8369449 + 669774400 = 2893^2 + 25880^2 .

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 678143849 - 2⁴ = 678143833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678143797 and 678143806.

It is not an unprimeable number, because it can be changed into a prime (678143819) 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, 3302 + ... + 36975.

It is an arithmetic number, because the mean of its divisors is an integer number (86094225).

Almost surely, 2^678143849 is an apocalyptic number.

It is an amenable number.

678143849 is a deficient number, since it is larger than the sum of its proper divisors (10609951).

678143849 is a wasteful number, since it uses less digits than its factorization.

678143849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40539.

The product of its digits is 1161216, while the sum is 50.

The square root of 678143849 is about 26041.1952298661. The cubic root of 678143849 is about 878.5650896521.

The spelling of 678143849 in words is "six hundred seventy-eight million, one hundred forty-three thousand, eight hundred forty-nine".