54721339920 has 120 divisors (see below), whose sum is σ = 197908879896. Its totient is φ = 13469865984.

The previous prime is 54721339913. The next prime is 54721339951. The reversal of 54721339920 is 2993312745.

54721339920 is a `hidden beast` number, since 5 + 47 + 213 + 399 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8767700496 + 45953639424 = 93636^2 + 214368^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2913789 + ... + 2932508.

Almost surely, 2^54721339920 is an apocalyptic number.

It is an amenable number.

54721339920 is an abundant number, since it is smaller than the sum of its proper divisors (143187539976).

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

54721339920 is a wasteful number, since it uses less digits than its factorization.

54721339920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5846329 (or 5846320 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 54721339920 in words is "fifty-four billion, seven hundred twenty-one million, three hundred thirty-nine thousand, nine hundred twenty".