65280221 has 8 divisors (see below), whose sum is σ = 69413760. Its totient is φ = 61179328.

The previous prime is 65280211. The next prime is 65280223. The reversal of 65280221 is 12208256.

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

It is not a de Polignac number, because 65280221 - 2⁶ = 65280157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65280223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3971 + ... + 12096.

It is an arithmetic number, because the mean of its divisors is an integer number (8676720).

Almost surely, 2^65280221 is an apocalyptic number.

It is an amenable number.

65280221 is a deficient number, since it is larger than the sum of its proper divisors (4133539).

65280221 is a wasteful number, since it uses less digits than its factorization.

65280221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16323.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 65280221 is about 8079.6176270910. The cubic root of 65280221 is about 402.6495382018.

Adding to 65280221 its reverse (12208256), we get a palindrome (77488477).

The spelling of 65280221 in words is "sixty-five million, two hundred eighty thousand, two hundred twenty-one".