522666640 has 40 divisors (see below), whose sum is σ = 1216495800. Its totient is φ = 208843776.

The previous prime is 522666629. The next prime is 522666653. The reversal of 522666640 is 46666225.

It is a happy number.

522666640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1183744 + 521482896 = 1088^2 + 22836^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 522666640.

It is an unprimeable number.

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, 86436 + ... + 92284.

It is an arithmetic number, because the mean of its divisors is an integer number (30412395).

Almost surely, 2^522666640 is an apocalyptic number.

It is an amenable number.

522666640 is an abundant number, since it is smaller than the sum of its proper divisors (693829160).

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

522666640 is a wasteful number, since it uses less digits than its factorization.

522666640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6979 (or 6973 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 522666640 is about 22861.9036827645. The cubic root of 522666640 is about 805.5174020314.

The spelling of 522666640 in words is "five hundred twenty-two million, six hundred sixty-six thousand, six hundred forty".