561279784 has 16 divisors (see below), whose sum is σ = 1133353620. Its totient is φ = 259052160.

The previous prime is 561279773. The next prime is 561279793. The reversal of 561279784 is 487972165.

It can be written as a sum of positive squares in 2 ways, for example, as 544288900 + 16990884 = 23330^2 + 4122^2 .

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 3 ways as a sum of consecutive naturals, for example, 2698357 + ... + 2698564.

Almost surely, 2^561279784 is an apocalyptic number.

It is an amenable number.

561279784 is an abundant number, since it is smaller than the sum of its proper divisors (572073836).

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

561279784 is a wasteful number, since it uses less digits than its factorization.

561279784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5396940 (or 5396936 counting only the distinct ones).

The product of its digits is 846720, while the sum is 49.

The square root of 561279784 is about 23691.3440733108. The cubic root of 561279784 is about 824.8844816524.

The spelling of 561279784 in words is "five hundred sixty-one million, two hundred seventy-nine thousand, seven hundred eighty-four".