53216640 has 96 divisors (see below), whose sum is σ = 183783600. Its totient is φ = 14189568.

The previous prime is 53216633. The next prime is 53216689. The reversal of 53216640 is 4661235.

53216640 is a `hidden beast` number, since 5 + 3 + 2 + 16 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-3 number, since 3×53216640³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1141 + ... + 10379.

Almost surely, 2^53216640 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 53216640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91891800).

53216640 is an abundant number, since it is smaller than the sum of its proper divisors (130566960).

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

53216640 is a wasteful number, since it uses less digits than its factorization.

53216640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9264 (or 9249 counting only the distinct ones).

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

The square root of 53216640 is about 7294.9736120153. The cubic root of 53216640 is about 376.1396795061.

Adding to 53216640 its reverse (4661235), we get a palindrome (57877875).

The spelling of 53216640 in words is "fifty-three million, two hundred sixteen thousand, six hundred forty".