561552774 has 64 divisors (see below), whose sum is σ = 1221350400. Its totient is φ = 171642240.

The previous prime is 561552773. The next prime is 561552907. The reversal of 561552774 is 477255165.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561552773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 361752 + ... + 363300.

It is an arithmetic number, because the mean of its divisors is an integer number (19083600).

Almost surely, 2^561552774 is an apocalyptic number.

561552774 is an abundant number, since it is smaller than the sum of its proper divisors (659797626).

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

561552774 is a wasteful number, since it uses less digits than its factorization.

561552774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685.

The product of its digits is 294000, while the sum is 42.

The square root of 561552774 is about 23697.1047598647. The cubic root of 561552774 is about 825.0181931709.

The spelling of 561552774 in words is "five hundred sixty-one million, five hundred fifty-two thousand, seven hundred seventy-four".