65621216 has 24 divisors (see below), whose sum is σ = 131385240. Its totient is φ = 32253568.

The previous prime is 65621183. The next prime is 65621249. The reversal of 65621216 is 61212656.

65621216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (65621183) and next prime (65621249).

It is a super-2 number, since 2×65621216² = 8612287978637312, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 15491 + ... + 19266.

It is an arithmetic number, because the mean of its divisors is an integer number (5474385).

Almost surely, 2^65621216 is an apocalyptic number.

It is an amenable number.

65621216 is an abundant number, since it is smaller than the sum of its proper divisors (65764024).

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

65621216 is a wasteful number, since it uses less digits than its factorization.

65621216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34826 (or 34818 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 65621216 is about 8100.6923160925. The cubic root of 65621216 is about 403.3494087044.

The spelling of 65621216 in words is "sixty-five million, six hundred twenty-one thousand, two hundred sixteen".