678854441 has 4 divisors (see below), whose sum is σ = 679420884. Its totient is φ = 678288000.

The previous prime is 678854411. The next prime is 678854443. The reversal of 678854441 is 144458876.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4932841 + 673921600 = 2221^2 + 25960^2 .

It is a cyclic number.

It is not a de Polignac number, because 678854441 - 2⁶ = 678854377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678854443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281420 + ... + 283821.

It is an arithmetic number, because the mean of its divisors is an integer number (169855221).

Almost surely, 2^678854441 is an apocalyptic number.

It is an amenable number.

678854441 is a deficient number, since it is larger than the sum of its proper divisors (566443).

678854441 is a wasteful number, since it uses less digits than its factorization.

678854441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566442.

The product of its digits is 860160, while the sum is 47.

The square root of 678854441 is about 26054.8352710202. The cubic root of 678854441 is about 878.8718502281.

The spelling of 678854441 in words is "six hundred seventy-eight million, eight hundred fifty-four thousand, four hundred forty-one".