61440232240 has 20 divisors (see below), whose sum is σ = 142848540144. Its totient is φ = 24576092864.

The previous prime is 61440232207. The next prime is 61440232267. The reversal of 61440232240 is 4223204416.

61440232240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 61440232199 and 61440232208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384001372 + ... + 384001531.

Almost surely, 2^61440232240 is an apocalyptic number.

It is an amenable number.

61440232240 is an abundant number, since it is smaller than the sum of its proper divisors (81408307904).

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

61440232240 is a wasteful number, since it uses less digits than its factorization.

61440232240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768002916 (or 768002910 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 61440232240 its reverse (4223204416), we get a palindrome (65663436656).

The spelling of 61440232240 in words is "sixty-one billion, four hundred forty million, two hundred thirty-two thousand, two hundred forty".