5640820 has 24 divisors (see below), whose sum is σ = 11982600. Its totient is φ = 2230272.

The previous prime is 5640781. The next prime is 5640823. The reversal of 5640820 is 280465.

It can be written as a sum of positive squares in 4 ways, for example, as 605284 + 5035536 = 778^2 + 2244^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5640823) 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, 196 + ... + 3364.

It is an arithmetic number, because the mean of its divisors is an integer number (499275).

Almost surely, 2^5640820 is an apocalyptic number.

It is an amenable number.

5640820 is an abundant number, since it is smaller than the sum of its proper divisors (6341780).

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

5640820 is a wasteful number, since it uses less digits than its factorization.

5640820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267 (or 3265 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 5640820 is about 2375.0410522768. The cubic root of 5640820 is about 178.0112352459.

It can be divided in two parts, 5 and 640820, that multiplied together give a square (3204100 = 1790²).

The spelling of 5640820 in words is "five million, six hundred forty thousand, eight hundred twenty".