561502620 has 144 divisors (see below), whose sum is σ = 1957475520. Its totient is φ = 127623168.

The previous prime is 561502609. The next prime is 561502631. The reversal of 561502620 is 26205165.

561502620 is a `hidden beast` number, since 5 + 615 + 0 + 26 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (561502609) and next prime (561502631).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 242026 + ... + 244334.

It is an arithmetic number, because the mean of its divisors is an integer number (13593580).

Almost surely, 2^561502620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561502620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978737760).

561502620 is an abundant number, since it is smaller than the sum of its proper divisors (1395972900).

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

561502620 is a wasteful number, since it uses less digits than its factorization.

561502620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524 (or 2519 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 561502620 is about 23696.0465056937. The cubic root of 561502620 is about 824.9936308048.

Adding to 561502620 its reverse (26205165), we get a palindrome (587707785).

The spelling of 561502620 in words is "five hundred sixty-one million, five hundred two thousand, six hundred twenty".