561640120 has 16 divisors (see below), whose sum is σ = 1263690360. Its totient is φ = 224656032.

The previous prime is 561640103. The next prime is 561640127. The reversal of 561640120 is 21046165.

It is a super-2 number, since 2×561640120² = 630879248787228800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561640127) 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, 7020462 + ... + 7020541.

Almost surely, 2^561640120 is an apocalyptic number.

It is an amenable number.

561640120 is an abundant number, since it is smaller than the sum of its proper divisors (702050240).

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

561640120 is a wasteful number, since it uses less digits than its factorization.

561640120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14041014 (or 14041010 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 561640120 is about 23698.9476559614. The cubic root of 561640120 is about 825.0609664159.

Adding to 561640120 its reverse (21046165), we get a palindrome (582686285).

The spelling of 561640120 in words is "five hundred sixty-one million, six hundred forty thousand, one hundred twenty".