678172722 has 8 divisors (see below), whose sum is σ = 1356345456. Its totient is φ = 226057572.

The previous prime is 678172717. The next prime is 678172723. The reversal of 678172722 is 227271876.

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

678172722 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (678172723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56514388 + ... + 56514399.

It is an arithmetic number, because the mean of its divisors is an integer number (169543182).

Almost surely, 2^678172722 is an apocalyptic number.

678172722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678172722 is a wasteful number, since it uses less digits than its factorization.

678172722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113028792.

The product of its digits is 131712, while the sum is 42.

The square root of 678172722 is about 26041.7495956013. The cubic root of 678172722 is about 878.5775582209.

The spelling of 678172722 in words is "six hundred seventy-eight million, one hundred seventy-two thousand, seven hundred twenty-two".