53821620 has 72 divisors (see below), whose sum is σ = 164900736. Its totient is φ = 14208192.

The previous prime is 53821613. The next prime is 53821657. The reversal of 53821620 is 2612835.

53821620 is a `hidden beast` number, since 5 + 38 + 2 + 1 + 620 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17089 + ... + 19991.

It is an arithmetic number, because the mean of its divisors is an integer number (2290288).

Almost surely, 2^53821620 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 53821620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82450368).

53821620 is an abundant number, since it is smaller than the sum of its proper divisors (111079116).

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

53821620 is a wasteful number, since it uses less digits than its factorization.

53821620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3021 (or 3016 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 53821620 is about 7336.3219667624. The cubic root of 53821620 is about 377.5596619297.

The spelling of 53821620 in words is "fifty-three million, eight hundred twenty-one thousand, six hundred twenty".