561439064 has 16 divisors (see below), whose sum is σ = 1075096800. Its totient is φ = 274746592.

The previous prime is 561439061. The next prime is 561439079. The reversal of 561439064 is 460934165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561439061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746219 + ... + 746970.

It is an arithmetic number, because the mean of its divisors is an integer number (67193550).

Almost surely, 2^561439064 is an apocalyptic number.

It is an amenable number.

561439064 is a deficient number, since it is larger than the sum of its proper divisors (513657736).

561439064 is a wasteful number, since it uses less digits than its factorization.

561439064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493242 (or 1493238 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 561439064 is about 23694.7054001522. The cubic root of 561439064 is about 824.9625028565.

The spelling of 561439064 in words is "five hundred sixty-one million, four hundred thirty-nine thousand, sixty-four".