678221067 has 8 divisors (see below), whose sum is σ = 904450960. Its totient is φ = 452069280.

The previous prime is 678221059. The next prime is 678221077. The reversal of 678221067 is 760122876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 678221067 - 2³ = 678221059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678221077) 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, 5217 + ... + 37197.

It is an arithmetic number, because the mean of its divisors is an integer number (113056370).

Almost surely, 2^678221067 is an apocalyptic number.

678221067 is a deficient number, since it is larger than the sum of its proper divisors (226229893).

678221067 is a wasteful number, since it uses less digits than its factorization.

678221067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39053.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 678221067 is about 26042.6778001034. The cubic root of 678221067 is about 878.5984348213.

The spelling of 678221067 in words is "six hundred seventy-eight million, two hundred twenty-one thousand, sixty-seven".