53309820 has 96 divisors (see below), whose sum is σ = 159022080. Its totient is φ = 13305600.

The previous prime is 53309803. The next prime is 53309833. The reversal of 53309820 is 2890335.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 114909 + ... + 115371.

It is an arithmetic number, because the mean of its divisors is an integer number (1656480).

Almost surely, 2^53309820 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 53309820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79511040).

53309820 is an abundant number, since it is smaller than the sum of its proper divisors (105712260).

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

53309820 is a wasteful number, since it uses less digits than its factorization.

53309820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595 (or 593 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 53309820 is about 7301.3574080441. The cubic root of 53309820 is about 376.3590861865.

The spelling of 53309820 in words is "fifty-three million, three hundred nine thousand, eight hundred twenty".