252513640 has 32 divisors (see below), whose sum is σ = 570034080. Its totient is φ = 100671552.

The previous prime is 252513637. The next prime is 252513647. The reversal of 252513640 is 46315252.

It is a junction number, because it is equal to n+sod(n) for n = 252513599 and 252513608.

It is not an unprimeable number, because it can be changed into a prime (252513647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1999 + ... + 22561.

It is an arithmetic number, because the mean of its divisors is an integer number (17813565).

Almost surely, 2^252513640 is an apocalyptic number.

252513640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

252513640 is an abundant number, since it is smaller than the sum of its proper divisors (317520440).

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

252513640 is a wasteful number, since it uses less digits than its factorization.

252513640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20881 (or 20877 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 252513640 is about 15890.6777703155. The cubic root of 252513640 is about 632.0648133605.

Adding to 252513640 its reverse (46315252), we get a palindrome (298828892).

The spelling of 252513640 in words is "two hundred fifty-two million, five hundred thirteen thousand, six hundred forty".