53252640 has 240 divisors, whose sum is σ = 215151552. Its totient is φ = 12151296.

The previous prime is 53252609. The next prime is 53252663. The reversal of 53252640 is 4625235.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 90427 + ... + 91013.

Almost surely, 2^53252640 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 53252640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107575776).

53252640 is an abundant number, since it is smaller than the sum of its proper divisors (161898912).

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

53252640 is a wasteful number, since it uses less digits than its factorization.

53252640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 53252640 is about 7297.4406472406. The cubic root of 53252640 is about 376.2244773952.

Adding to 53252640 its reverse (4625235), we get a palindrome (57877875).

The spelling of 53252640 in words is "fifty-three million, two hundred fifty-two thousand, six hundred forty".