53709921720 has 1536 divisors, whose sum is σ = 245584281600. Its totient is φ = 10152345600.

The previous prime is 53709921679. The next prime is 53709921739. The reversal of 53709921720 is 2712990735.

53709921720 is a `hidden beast` number, since 537 + 0 + 9 + 92 + 1 + 7 + 20 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 880490490 + ... + 880490550.

It is an arithmetic number, because the mean of its divisors is an integer number (159885600).

Almost surely, 2^53709921720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53709921720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122792140800).

53709921720 is an abundant number, since it is smaller than the sum of its proper divisors (191874359880).

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

53709921720 is a wasteful number, since it uses less digits than its factorization.

53709921720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The spelling of 53709921720 in words is "fifty-three billion, seven hundred nine million, nine hundred twenty-one thousand, seven hundred twenty".