531736640 has 28 divisors (see below), whose sum is σ = 1266198636. Its totient is φ = 212694528.

The previous prime is 531736633. The next prime is 531736643. The reversal of 531736640 is 46637135.

It can be written as a sum of positive squares in 2 ways, for example, as 54051904 + 477684736 = 7352^2 + 21856^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 531736640.

It is not an unprimeable number, because it can be changed into a prime (531736643) 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 3 ways as a sum of consecutive naturals, for example, 830519 + ... + 831158.

Almost surely, 2^531736640 is an apocalyptic number.

It is an amenable number.

531736640 is an abundant number, since it is smaller than the sum of its proper divisors (734461996).

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

531736640 is a wasteful number, since it uses less digits than its factorization.

531736640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661694 (or 1661684 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 531736640 is about 23059.4154305785. The cubic root of 531736640 is about 810.1501728372.

The spelling of 531736640 in words is "five hundred thirty-one million, seven hundred thirty-six thousand, six hundred forty".