54721309920 has 96 divisors (see below), whose sum is σ = 173145434112. Its totient is φ = 14526884352.

The previous prime is 54721309889. The next prime is 54721309961. The reversal of 54721309920 is 2990312745.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148572 + ... + 362651.

It is an arithmetic number, because the mean of its divisors is an integer number (1803598272).

Almost surely, 2^54721309920 is an apocalyptic number.

It is an amenable number.

54721309920 is an abundant number, since it is smaller than the sum of its proper divisors (118424124192).

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

54721309920 is a wasteful number, since it uses less digits than its factorization.

54721309920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511464 (or 511456 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 54721309920 in words is "fifty-four billion, seven hundred twenty-one million, three hundred nine thousand, nine hundred twenty".