561408228 has 36 divisors (see below), whose sum is σ = 1425387600. Its totient is φ = 186308976.

The previous prime is 561408223. The next prime is 561408241. The reversal of 561408228 is 822804165.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 561408192 and 561408201.

It is not an unprimeable number, because it can be changed into a prime (561408223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26178 + ... + 42521.

It is an arithmetic number, because the mean of its divisors is an integer number (39594100).

Almost surely, 2^561408228 is an apocalyptic number.

It is an amenable number.

561408228 is an abundant number, since it is smaller than the sum of its proper divisors (863979372).

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

561408228 is a wasteful number, since it uses less digits than its factorization.

561408228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68936 (or 68931 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 561408228 is about 23694.0546973286. The cubic root of 561408228 is about 824.9473994012.

The spelling of 561408228 in words is "five hundred sixty-one million, four hundred eight thousand, two hundred twenty-eight".