54781540 has 36 divisors (see below), whose sum is σ = 126455868. Its totient is φ = 19919680.

The previous prime is 54781537. The next prime is 54781549. The reversal of 54781540 is 4518745.

54781540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 17106496 + 37675044 = 4136^2 + 6138^2 .

It is a junction number, because it is equal to n+sod(n) for n = 54781496 and 54781505.

It is not an unprimeable number, because it can be changed into a prime (54781549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8899 + ... + 13738.

It is an arithmetic number, because the mean of its divisors is an integer number (3512663).

Almost surely, 2^54781540 is an apocalyptic number.

It is an amenable number.

54781540 is an abundant number, since it is smaller than the sum of its proper divisors (71674328).

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

54781540 is a wasteful number, since it uses less digits than its factorization.

54781540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22668 (or 22655 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 54781540 is about 7401.4552623116. The cubic root of 54781540 is about 379.7910670469.

The spelling of 54781540 in words is "fifty-four million, seven hundred eighty-one thousand, five hundred forty".