561137720 has 64 divisors (see below), whose sum is σ = 1483302240. Its totient is φ = 188352000.

The previous prime is 561137713. The next prime is 561137723. The reversal of 561137720 is 27731165.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561137723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43331 + ... + 54770.

Almost surely, 2^561137720 is an apocalyptic number.

It is an amenable number.

561137720 is an abundant number, since it is smaller than the sum of its proper divisors (922164520).

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

561137720 is a wasteful number, since it uses less digits than its factorization.

561137720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98136 (or 98132 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 561137720 is about 23688.3456577280. The cubic root of 561137720 is about 824.8148810238.

Adding to 561137720 its reverse (27731165), we get a palindrome (588868885).

The spelling of 561137720 in words is "five hundred sixty-one million, one hundred thirty-seven thousand, seven hundred twenty".