561227820 has 24 divisors (see below), whose sum is σ = 1571438064. Its totient is φ = 149660736.

The previous prime is 561227809. The next prime is 561227831. The reversal of 561227820 is 28722165.

It is an interprime number because it is at equal distance from previous prime (561227809) and next prime (561227831).

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 7 ways as a sum of consecutive naturals, for example, 4676839 + ... + 4676958.

It is an arithmetic number, because the mean of its divisors is an integer number (65476586).

Almost surely, 2^561227820 is an apocalyptic number.

It is an amenable number.

561227820 is an abundant number, since it is smaller than the sum of its proper divisors (1010210244).

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

561227820 is a wasteful number, since it uses less digits than its factorization.

561227820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9353809 (or 9353807 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 561227820 is about 23690.2473604646. The cubic root of 561227820 is about 824.8590245801.

Adding to 561227820 its reverse (28722165), we get a palindrome (589949985).

The spelling of 561227820 in words is "five hundred sixty-one million, two hundred twenty-seven thousand, eight hundred twenty".