53973640 has 192 divisors, whose sum is σ = 159148800. Its totient is φ = 16084992.

The previous prime is 53973631. The next prime is 53973677. The reversal of 53973640 is 4637935.

It is a self number, because there is not a number n which added to its sum of digits gives 53973640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1861146 + ... + 1861174.

It is an arithmetic number, because the mean of its divisors is an integer number (828900).

Almost surely, 2^53973640 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 53973640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79574400).

53973640 is an abundant number, since it is smaller than the sum of its proper divisors (105175160).

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

53973640 is a wasteful number, since it uses less digits than its factorization.

53973640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 37.

The square root of 53973640 is about 7346.6754385913. The cubic root of 53973640 is about 377.9148021455.

The spelling of 53973640 in words is "fifty-three million, nine hundred seventy-three thousand, six hundred forty".