772655221 has 16 divisors (see below), whose sum is σ = 842849280. Its totient is φ = 704044800.

The previous prime is 772655183. The next prime is 772655227. The reversal of 772655221 is 122556277.

772655221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 772655221 - 2¹¹ = 772653173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (772655227) 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, 536220 + ... + 537658.

It is an arithmetic number, because the mean of its divisors is an integer number (52678080).

Almost surely, 2^772655221 is an apocalyptic number.

It is an amenable number.

772655221 is a deficient number, since it is larger than the sum of its proper divisors (70194059).

772655221 is a wasteful number, since it uses less digits than its factorization.

772655221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956.

The product of its digits is 58800, while the sum is 37.

The square root of 772655221 is about 27796.6764380204. The cubic root of 772655221 is about 917.6179797650.

The spelling of 772655221 in words is "seven hundred seventy-two million, six hundred fifty-five thousand, two hundred twenty-one".