561886678 has 4 divisors (see below), whose sum is σ = 842830020. Its totient is φ = 280943338.

The previous prime is 561886651. The next prime is 561886679. The reversal of 561886678 is 876688165.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561886679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140471668 + ... + 140471671.

It is an arithmetic number, because the mean of its divisors is an integer number (210707505).

Almost surely, 2^561886678 is an apocalyptic number.

561886678 is a deficient number, since it is larger than the sum of its proper divisors (280943342).

561886678 is a wasteful number, since it uses less digits than its factorization.

561886678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280943341.

The product of its digits is 3870720, while the sum is 55.

The square root of 561886678 is about 23704.1489617324. The cubic root of 561886678 is about 825.1816816889.

The spelling of 561886678 in words is "five hundred sixty-one million, eight hundred eighty-six thousand, six hundred seventy-eight".