53216388 has 36 divisors (see below), whose sum is σ = 140370048. Its totient is φ = 16967280.

The previous prime is 53216377. The next prime is 53216389. The reversal of 53216388 is 88361235.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (53216389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31308 + ... + 32963.

It is an arithmetic number, because the mean of its divisors is an integer number (3899168).

Almost surely, 2^53216388 is an apocalyptic number.

It is an amenable number.

53216388 is an abundant number, since it is smaller than the sum of its proper divisors (87153660).

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

53216388 is a wasteful number, since it uses less digits than its factorization.

53216388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64304 (or 64299 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 53216388 is about 7294.9563398282. The cubic root of 53216388 is about 376.1390857862.

The spelling of 53216388 in words is "fifty-three million, two hundred sixteen thousand, three hundred eighty-eight".