5721216 has 64 divisors (see below), whose sum is σ = 15569280. Its totient is φ = 1860608.

The previous prime is 5721211. The next prime is 5721241. The reversal of 5721216 is 6121275.

5721216 = T₈ + T₉ + ... + T₃₂₄.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (5721211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17890 + ... + 18206.

It is an arithmetic number, because the mean of its divisors is an integer number (243270).

Almost surely, 2^5721216 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 5721216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7784640).

5721216 is an abundant number, since it is smaller than the sum of its proper divisors (9848064).

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

5721216 is a wasteful number, since it uses less digits than its factorization.

5721216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 369 counting only the distinct ones).

The product of its digits is 840, while the sum is 24.

The square root of 5721216 is about 2391.9063526819. The cubic root of 5721216 is about 178.8529529011.

The spelling of 5721216 in words is "five million, seven hundred twenty-one thousand, two hundred sixteen".