531553640 has 16 divisors (see below), whose sum is σ = 1195995780. Its totient is φ = 212621440.

The previous prime is 531553639. The next prime is 531553717. The reversal of 531553640 is 46355135.

It can be written as a sum of positive squares in 2 ways, for example, as 518837284 + 12716356 = 22778^2 + 3566^2 .

It is a junction number, because it is equal to n+sod(n) for n = 531553597 and 531553606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6644381 + ... + 6644460.

Almost surely, 2^531553640 is an apocalyptic number.

It is an amenable number.

531553640 is an abundant number, since it is smaller than the sum of its proper divisors (664442140).

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

531553640 is a wasteful number, since it uses less digits than its factorization.

531553640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13288852 (or 13288848 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 531553640 is about 23055.4470787274. The cubic root of 531553640 is about 810.0572230061.

The spelling of 531553640 in words is "five hundred thirty-one million, five hundred fifty-three thousand, six hundred forty".