5721870 has 64 divisors (see below), whose sum is σ = 17127936. Its totient is φ = 1188480.

The previous prime is 5721853. The next prime is 5721889. The reversal of 5721870 is 781275.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1072 + ... + 3548.

It is an arithmetic number, because the mean of its divisors is an integer number (267624).

Almost surely, 2^5721870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5721870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8563968).

5721870 is an abundant number, since it is smaller than the sum of its proper divisors (11406066).

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

5721870 is a wasteful number, since it uses less digits than its factorization.

5721870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 5721870 is about 2392.0430598131. The cubic root of 5721870 is about 178.8597676164.

It can be divided in two parts, 572 and 1870, that added together give a palindrome (2442).

The spelling of 5721870 in words is "five million, seven hundred twenty-one thousand, eight hundred seventy".