678663229 has 4 divisors (see below), whose sum is σ = 685005984. Its totient is φ = 672320476.

The previous prime is 678663217. The next prime is 678663269. The reversal of 678663229 is 922366876.

It is a happy number.

678663229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 678663229 - 2¹⁹ = 678138941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678663269) 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, 3171217 + ... + 3171430.

It is an arithmetic number, because the mean of its divisors is an integer number (171251496).

Almost surely, 2^678663229 is an apocalyptic number.

It is an amenable number.

678663229 is a deficient number, since it is larger than the sum of its proper divisors (6342755).

678663229 is a wasteful number, since it uses less digits than its factorization.

678663229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6342754.

The product of its digits is 1306368, while the sum is 49.

The square root of 678663229 is about 26051.1655977233. The cubic root of 678663229 is about 878.7893256029.

The spelling of 678663229 in words is "six hundred seventy-eight million, six hundred sixty-three thousand, two hundred twenty-nine".