53217620 has 48 divisors (see below), whose sum is σ = 114690576. Its totient is φ = 20736000.

The previous prime is 53217601. The next prime is 53217623. The reversal of 53217620 is 2671235.

It can be written as a sum of positive squares in 8 ways, for example, as 16032016 + 37185604 = 4004^2 + 6098^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 53217620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53217623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220700 + ... + 220940.

It is an arithmetic number, because the mean of its divisors is an integer number (2389387).

Almost surely, 2^53217620 is an apocalyptic number.

It is an amenable number.

53217620 is an abundant number, since it is smaller than the sum of its proper divisors (61472956).

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

53217620 is a wasteful number, since it uses less digits than its factorization.

53217620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 53217620 is about 7295.0407812431. The cubic root of 53217620 is about 376.1419883994.

Adding to 53217620 its reverse (2671235), we get a palindrome (55888855).

The spelling of 53217620 in words is "fifty-three million, two hundred seventeen thousand, six hundred twenty".