64503216 has 100 divisors (see below), whose sum is σ = 189590544. Its totient is φ = 21168000.

The previous prime is 64503181. The next prime is 64503217. The reversal of 64503216 is 61230546.

64503216 is a `hidden beast` number, since 645 + 0 + 3 + 2 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 64503216.

It is not an unprimeable number, because it can be changed into a prime (64503217) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 91666 + ... + 92366.

Almost surely, 2^64503216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64503216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94795272).

64503216 is an abundant number, since it is smaller than the sum of its proper divisors (125087328).

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

64503216 is a wasteful number, since it uses less digits than its factorization.

64503216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 64503216 is about 8031.3894190233. The cubic root of 64503216 is about 401.0456309249.

The spelling of 64503216 in words is "sixty-four million, five hundred three thousand, two hundred sixteen".