678221011 has 4 divisors (see below), whose sum is σ = 730391872. Its totient is φ = 626050152.

The previous prime is 678220969. The next prime is 678221059. The reversal of 678221011 is 110122876.

678221011 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.

It is not a de Polignac number, because 678221011 - 2²¹ = 676123859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678221711) 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, 26085411 + ... + 26085436.

It is an arithmetic number, because the mean of its divisors is an integer number (182597968).

Almost surely, 2^678221011 is an apocalyptic number.

678221011 is a deficient number, since it is larger than the sum of its proper divisors (52170861).

678221011 is a wasteful number, since it uses less digits than its factorization.

678221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52170860.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 678221011 is about 26042.6767249452. The cubic root of 678221011 is about 878.5984106397.

Adding to 678221011 its reverse (110122876), we get a palindrome (788343887).

The spelling of 678221011 in words is "six hundred seventy-eight million, two hundred twenty-one thousand, eleven".