53145620 has 36 divisors (see below), whose sum is σ = 122679732. Its totient is φ = 19324800.

The previous prime is 53145619. The next prime is 53145623. The reversal of 53145620 is 2654135.

53145620 = 104² + 105² + ... + 543².

It can be written as a sum of positive squares in 2 ways, for example, as 30980356 + 22165264 = 5566^2 + 4708^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 53145620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53145623) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 8561 + ... + 13400.

Almost surely, 2^53145620 is an apocalyptic number.

It is an amenable number.

53145620 is an abundant number, since it is smaller than the sum of its proper divisors (69534112).

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

53145620 is a wasteful number, since it uses less digits than its factorization.

53145620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21992 (or 21979 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 53145620 is about 7290.1042516551. The cubic root of 53145620 is about 375.9722799090.

Adding to 53145620 its reverse (2654135), we get a palindrome (55799755).

The spelling of 53145620 in words is "fifty-three million, one hundred forty-five thousand, six hundred twenty".