561300778 has 4 divisors (see below), whose sum is σ = 841951170. Its totient is φ = 280650388.

The previous prime is 561300739. The next prime is 561300811. The reversal of 561300778 is 877003165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 520889329 + 40411449 = 22823^2 + 6357^2 .

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 as a sum of consecutive naturals, namely, 140325193 + ... + 140325196.

Almost surely, 2^561300778 is an apocalyptic number.

561300778 is a deficient number, since it is larger than the sum of its proper divisors (280650392).

561300778 is a wasteful number, since it uses less digits than its factorization.

561300778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280650391.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 561300778 is about 23691.7871423833. The cubic root of 561300778 is about 824.8947661304.

The spelling of 561300778 in words is "five hundred sixty-one million, three hundred thousand, seven hundred seventy-eight".