678804851 has 4 divisors (see below), whose sum is σ = 678857112. Its totient is φ = 678752592.

The previous prime is 678804839. The next prime is 678804857. The reversal of 678804851 is 158408876.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 678804851 - 2⁶ = 678804787 is a prime.

It is a super-2 number, since 2×678804851² = 921552051482264402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678804796 and 678804805.

It is not an unprimeable number, because it can be changed into a prime (678804857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10076 + ... + 38198.

It is an arithmetic number, because the mean of its divisors is an integer number (169714278).

Almost surely, 2^678804851 is an apocalyptic number.

678804851 is a deficient number, since it is larger than the sum of its proper divisors (52261).

678804851 is a wasteful number, since it uses less digits than its factorization.

678804851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52260.

The product of its (nonzero) digits is 430080, while the sum is 47.

The square root of 678804851 is about 26053.8836068637. The cubic root of 678804851 is about 878.8504493142.

The spelling of 678804851 in words is "six hundred seventy-eight million, eight hundred four thousand, eight hundred fifty-one".