561064374 has 64 divisors (see below), whose sum is σ = 1379071680. Its totient is φ = 167961600.

The previous prime is 561064303. The next prime is 561064423. The reversal of 561064374 is 473460165.

It is a happy number.

561064374 is a `hidden beast` number, since 5 + 6 + 1 + 0 + 643 + 7 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15174 + ... + 36774.

It is an arithmetic number, because the mean of its divisors is an integer number (21547995).

Almost surely, 2^561064374 is an apocalyptic number.

561064374 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 561064374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689535840).

561064374 is an abundant number, since it is smaller than the sum of its proper divisors (818007306).

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

561064374 is a wasteful number, since it uses less digits than its factorization.

561064374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21662 (or 21656 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 561064374 is about 23686.7974618774. The cubic root of 561064374 is about 824.7789424261.

The spelling of 561064374 in words is "five hundred sixty-one million, sixty-four thousand, three hundred seventy-four".