61481540 has 24 divisors (see below), whose sum is σ = 131302080. Its totient is φ = 24175328.

The previous prime is 61481491. The next prime is 61481561. The reversal of 61481540 is 4518416.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24872 + ... + 27231.

It is an arithmetic number, because the mean of its divisors is an integer number (5470920).

Almost surely, 2^61481540 is an apocalyptic number.

It is an amenable number.

61481540 is an abundant number, since it is smaller than the sum of its proper divisors (69820540).

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

61481540 is a wasteful number, since it uses less digits than its factorization.

61481540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52171 (or 52169 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 61481540 is about 7841.0165157331. The cubic root of 61481540 is about 394.6828410682.

Adding to 61481540 its reverse (4518416), we get a palindrome (65999956).

The spelling of 61481540 in words is "sixty-one million, four hundred eighty-one thousand, five hundred forty".