5681820 has 48 divisors (see below), whose sum is σ = 16013088. Its totient is φ = 1505280.

The previous prime is 5681803. The next prime is 5681861. The reversal of 5681820 is 281865.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16692 + ... + 17028.

It is an arithmetic number, because the mean of its divisors is an integer number (333606).

Almost surely, 2^5681820 is an apocalyptic number.

It is an amenable number.

5681820 is an abundant number, since it is smaller than the sum of its proper divisors (10331268).

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

5681820 is a wasteful number, since it uses less digits than its factorization.

5681820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 5681820 is about 2383.6568544990. The cubic root of 5681820 is about 178.4414829097.

The spelling of 5681820 in words is "five million, six hundred eighty-one thousand, eight hundred twenty".