61440021260 has 48 divisors (see below), whose sum is σ = 130956086016. Its totient is φ = 24209714112.

The previous prime is 61440021259. The next prime is 61440021277. The reversal of 61440021260 is 6212004416.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522689 + ... + 629351.

It is an arithmetic number, because the mean of its divisors is an integer number (2728251792).

Almost surely, 2^61440021260 is an apocalyptic number.

It is an amenable number.

61440021260 is an abundant number, since it is smaller than the sum of its proper divisors (69516064756).

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

61440021260 is a wasteful number, since it uses less digits than its factorization.

61440021260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107102 (or 107100 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 61440021260 its reverse (6212004416), we get a palindrome (67652025676).

The spelling of 61440021260 in words is "sixty-one billion, four hundred forty million, twenty-one thousand, two hundred sixty".