677144221 has 16 divisors (see below), whose sum is σ = 773741808. Its totient is φ = 587059200.

The previous prime is 677144213. The next prime is 677144227. The reversal of 677144221 is 122441776.

It is a happy number.

677144221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 416025 + 676728196 = 645^2 + 26014^2 .

It is not a de Polignac number, because 677144221 - 2³ = 677144213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (677144227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112201 + ... + 118081.

It is an arithmetic number, because the mean of its divisors is an integer number (48358863).

Almost surely, 2^677144221 is an apocalyptic number.

It is an amenable number.

677144221 is a deficient number, since it is larger than the sum of its proper divisors (96597587).

677144221 is a wasteful number, since it uses less digits than its factorization.

677144221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432.

The product of its digits is 18816, while the sum is 34.

The square root of 677144221 is about 26021.9949465832. The cubic root of 677144221 is about 878.1331900656.

Adding to 677144221 its reverse (122441776), we get a palindrome (799585997).

The spelling of 677144221 in words is "six hundred seventy-seven million, one hundred forty-four thousand, two hundred twenty-one".