678728722 has 8 divisors (see below), whose sum is σ = 1163534976. Its totient is φ = 290883732.

The previous prime is 678728711. The next prime is 678728747. The reversal of 678728722 is 227827876.

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

It is an unprimeable number.

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, 24240298 + ... + 24240325.

It is an arithmetic number, because the mean of its divisors is an integer number (145441872).

Almost surely, 2^678728722 is an apocalyptic number.

678728722 is a deficient number, since it is larger than the sum of its proper divisors (484806254).

678728722 is a wasteful number, since it uses less digits than its factorization.

678728722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48480632.

The product of its digits is 1053696, while the sum is 49.

The square root of 678728722 is about 26052.4225744939. The cubic root of 678728722 is about 878.8175932795.

The spelling of 678728722 in words is "six hundred seventy-eight million, seven hundred twenty-eight thousand, seven hundred twenty-two".