65221272 has 48 divisors (see below), whose sum is σ = 182345280. Its totient is φ = 21038400.

The previous prime is 65221259. The next prime is 65221297. The reversal of 65221272 is 27212256.

65221272 is a `hidden beast` number, since 652 + 2 + 1 + 2 + 7 + 2 = 666.

65221272 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12379 + ... + 16842.

It is an arithmetic number, because the mean of its divisors is an integer number (3798860).

Almost surely, 2^65221272 is an apocalyptic number.

65221272 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

65221272 is an abundant number, since it is smaller than the sum of its proper divisors (117124008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65221272 is a wasteful number, since it uses less digits than its factorization.

65221272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29264 (or 29257 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 65221272 is about 8075.9687963736. The cubic root of 65221272 is about 402.5283022162.

The spelling of 65221272 in words is "sixty-five million, two hundred twenty-one thousand, two hundred seventy-two".