561879894 has 48 divisors (see below), whose sum is σ = 1194663600. Its totient is φ = 176143680.

The previous prime is 561879887. The next prime is 561879919. The reversal of 561879894 is 498978165.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 321864 + ... + 323604.

It is an arithmetic number, because the mean of its divisors is an integer number (24888825).

Almost surely, 2^561879894 is an apocalyptic number.

561879894 is an abundant number, since it is smaller than the sum of its proper divisors (632783706).

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

561879894 is a wasteful number, since it uses less digits than its factorization.

561879894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933 (or 1914 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 57.

The square root of 561879894 is about 23704.0058639885. The cubic root of 561879894 is about 825.1783607019.

The spelling of 561879894 in words is "five hundred sixty-one million, eight hundred seventy-nine thousand, eight hundred ninety-four".