61487386440 has 32 divisors (see below), whose sum is σ = 184462159680. Its totient is φ = 16396636352.

The previous prime is 61487386409. The next prime is 61487386447. The reversal of 61487386440 is 4468378416.

61487386440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61487386447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256197324 + ... + 256197563.

It is an arithmetic number, because the mean of its divisors is an integer number (5764442490).

Almost surely, 2^61487386440 is an apocalyptic number.

61487386440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61487386440 is an abundant number, since it is smaller than the sum of its proper divisors (122974773240).

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

61487386440 is a wasteful number, since it uses less digits than its factorization.

61487386440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512394901 (or 512394897 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 61487386440 in words is "sixty-one billion, four hundred eighty-seven million, three hundred eighty-six thousand, four hundred forty".