64509216 has 24 divisors (see below), whose sum is σ = 169336944. Its totient is φ = 21503040.

The previous prime is 64509191. The next prime is 64509229. The reversal of 64509216 is 61290546.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×64509216² = 8322877897869312, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335890 + ... + 336081.

It is an arithmetic number, because the mean of its divisors is an integer number (7055706).

Almost surely, 2^64509216 is an apocalyptic number.

It is an amenable number.

64509216 is an abundant number, since it is smaller than the sum of its proper divisors (104827728).

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

64509216 is a wasteful number, since it uses less digits than its factorization.

64509216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671984 (or 671976 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 64509216 is about 8031.7629447090. The cubic root of 64509216 is about 401.0580654427.

The spelling of 64509216 in words is "sixty-four million, five hundred nine thousand, two hundred sixteen".