3561844820 has 24 divisors (see below), whose sum is σ = 7721161728. Its totient is φ = 1378778400.

The previous prime is 3561844817. The next prime is 3561844829. The reversal of 3561844820 is 284481653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561844829) 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, 2871836 + ... + 2873075.

It is an arithmetic number, because the mean of its divisors is an integer number (321715072).

Almost surely, 2^3561844820 is an apocalyptic number.

It is an amenable number.

3561844820 is an abundant number, since it is smaller than the sum of its proper divisors (4159316908).

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

3561844820 is a wasteful number, since it uses less digits than its factorization.

3561844820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744951 (or 5744949 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The square root of 3561844820 is about 59681.1931851232. The cubic root of 3561844820 is about 1527.1850529684.

The spelling of 3561844820 in words is "three billion, five hundred sixty-one million, eight hundred forty-four thousand, eight hundred twenty".