52136640 has 168 divisors, whose sum is σ = 183934608. Its totient is φ = 13547520.

The previous prime is 52136629. The next prime is 52136647. The reversal of 52136640 is 4663125.

52136640 is a `hidden beast` number, since 5 + 2 + 13 + 6 + 640 = 666.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (52136647) 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 23 ways as a sum of consecutive naturals, for example, 123630 + ... + 124050.

Almost surely, 2^52136640 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 52136640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91967304).

52136640 is an abundant number, since it is smaller than the sum of its proper divisors (131797968).

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

52136640 is a wasteful number, since it uses less digits than its factorization.

52136640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 52136640 is about 7220.5706145706. The cubic root of 52136640 is about 373.5777594373.

Adding to 52136640 its reverse (4663125), we get a palindrome (56799765).

The spelling of 52136640 in words is "fifty-two million, one hundred thirty-six thousand, six hundred forty".