561814890 has 96 divisors (see below), whose sum is σ = 1689206400. Its totient is φ = 118532736.

The previous prime is 561814889. The next prime is 561814921. The reversal of 561814890 is 98418165.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4411 + ... + 33809.

It is an arithmetic number, because the mean of its divisors is an integer number (17595900).

Almost surely, 2^561814890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561814890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (844603200).

561814890 is an abundant number, since it is smaller than the sum of its proper divisors (1127391510).

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

561814890 is a wasteful number, since it uses less digits than its factorization.

561814890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29436 (or 29429 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 561814890 is about 23702.6346636824. The cubic root of 561814890 is about 825.1465377902.

The spelling of 561814890 in words is "five hundred sixty-one million, eight hundred fourteen thousand, eight hundred ninety".