561149478 has 64 divisors (see below), whose sum is σ = 1314532800. Its totient is φ = 177166080.

The previous prime is 561149473. The next prime is 561149489. The reversal of 561149478 is 874941165.

561149478 is a `hidden beast` number, since 561 + 1 + 49 + 47 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561149473) 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, 79618 + ... + 86378.

It is an arithmetic number, because the mean of its divisors is an integer number (20539575).

Almost surely, 2^561149478 is an apocalyptic number.

561149478 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 561149478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (657266400).

561149478 is an abundant number, since it is smaller than the sum of its proper divisors (753383322).

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

561149478 is a wasteful number, since it uses less digits than its factorization.

561149478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6854 (or 6848 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 561149478 is about 23688.5938375413. The cubic root of 561149478 is about 824.8206420015.

The spelling of 561149478 in words is "five hundred sixty-one million, one hundred forty-nine thousand, four hundred seventy-eight".