5721642 has 48 divisors (see below), whose sum is σ = 13071240. Its totient is φ = 1806336.

The previous prime is 5721631. The next prime is 5721649. The reversal of 5721642 is 2461275.

It can be written as a sum of positive squares in 4 ways, for example, as 3164841 + 2556801 = 1779^2 + 1599^2 .

It is not an unprimeable number, because it can be changed into a prime (5721649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50578 + ... + 50690.

Almost surely, 2^5721642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5721642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6535620).

5721642 is an abundant number, since it is smaller than the sum of its proper divisors (7349598).

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

5721642 is a wasteful number, since it uses less digits than its factorization.

5721642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 244 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 5721642 is about 2391.9954013334. The cubic root of 5721642 is about 178.8573919030.

The spelling of 5721642 in words is "five million, seven hundred twenty-one thousand, six hundred forty-two".