653520040 has 32 divisors (see below), whose sum is σ = 1485587880. Its totient is φ = 258711552.

The previous prime is 653519989. The next prime is 653520047. The reversal of 653520040 is 40025356.

It can be written as a sum of positive squares in 4 ways, for example, as 352913796 + 300606244 = 18786^2 + 17338^2 .

It is a junction number, because it is equal to n+sod(n) for n = 653519987 and 653520014.

It is not an unprimeable number, because it can be changed into a prime (653520047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80337 + ... + 88096.

Almost surely, 2^653520040 is an apocalyptic number.

It is an amenable number.

653520040 is an abundant number, since it is smaller than the sum of its proper divisors (832067840).

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

653520040 is a wasteful number, since it uses less digits than its factorization.

653520040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168541 (or 168537 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 653520040 is about 25564.0380221905. The cubic root of 653520040 is about 867.7999815194.

Adding to 653520040 its reverse (40025356), we get a palindrome (693545396).

The spelling of 653520040 in words is "six hundred fifty-three million, five hundred twenty thousand, forty".