53981664 has 192 divisors, whose sum is σ = 170698752. Its totient is φ = 14745600.

The previous prime is 53981651. The next prime is 53981687. The reversal of 53981664 is 46618935.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 556464 + ... + 556560.

It is an arithmetic number, because the mean of its divisors is an integer number (889056).

Almost surely, 2^53981664 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 53981664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85349376).

53981664 is an abundant number, since it is smaller than the sum of its proper divisors (116717088).

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

53981664 is a wasteful number, since it uses less digits than its factorization.

53981664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 161 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 53981664 is about 7347.2215156479. The cubic root of 53981664 is about 377.9335288061.

It can be divided in two parts, 53981 and 664, that added together give a palindrome (54645).

The spelling of 53981664 in words is "fifty-three million, nine hundred eighty-one thousand, six hundred sixty-four".