65228221 has 8 divisors (see below), whose sum is σ = 67609080. Its totient is φ = 62856192.

The previous prime is 65228209. The next prime is 65228227. The reversal of 65228221 is 12282256.

It can be written as a sum of positive squares in 4 ways, for example, as 5336100 + 59892121 = 2310^2 + 7739^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 65228221 - 2²³ = 56839613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65228221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65228227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15301 + ... + 19093.

It is an arithmetic number, because the mean of its divisors is an integer number (8451135).

Almost surely, 2^65228221 is an apocalyptic number.

It is an amenable number.

65228221 is a deficient number, since it is larger than the sum of its proper divisors (2380859).

65228221 is a wasteful number, since it uses less digits than its factorization.

65228221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415.

The product of its digits is 3840, while the sum is 28.

The square root of 65228221 is about 8076.3990119360. The cubic root of 65228221 is about 402.5425975003.

The spelling of 65228221 in words is "sixty-five million, two hundred twenty-eight thousand, two hundred twenty-one".