5721638 has 8 divisors (see below), whose sum is σ = 9242688. Its totient is φ = 2640744.

The previous prime is 5721631. The next prime is 5721649. The reversal of 5721638 is 8361275.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5721631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110006 + ... + 110057.

It is an arithmetic number, because the mean of its divisors is an integer number (1155336).

Almost surely, 2^5721638 is an apocalyptic number.

5721638 is a deficient number, since it is larger than the sum of its proper divisors (3521050).

5721638 is a wasteful number, since it uses less digits than its factorization.

5721638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220078.

The product of its digits is 10080, while the sum is 32.

The square root of 5721638 is about 2391.9945652112. The cubic root of 5721638 is about 178.8573502233.

The spelling of 5721638 in words is "five million, seven hundred twenty-one thousand, six hundred thirty-eight".