53012820 has 96 divisors (see below), whose sum is σ = 171295488. Its totient is φ = 11999232.

The previous prime is 53012809. The next prime is 53012833. The reversal of 53012820 is 2821035.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 46902 + ... + 48018.

It is an arithmetic number, because the mean of its divisors is an integer number (1784328).

Almost surely, 2^53012820 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 53012820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85647744).

53012820 is an abundant number, since it is smaller than the sum of its proper divisors (118282668).

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

53012820 is a wasteful number, since it uses less digits than its factorization.

53012820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 53012820 is about 7280.9903172577. The cubic root of 53012820 is about 375.6588595109.

Adding to 53012820 its reverse (2821035), we get a palindrome (55833855).

The spelling of 53012820 in words is "fifty-three million, twelve thousand, eight hundred twenty".