522645420 has 48 divisors (see below), whose sum is σ = 1596446208. Its totient is φ = 126701760.

The previous prime is 522645391. The next prime is 522645427. The reversal of 522645420 is 24546225.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (522645427) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 395284 + ... + 396603.

It is an arithmetic number, because the mean of its divisors is an integer number (33259296).

Almost surely, 2^522645420 is an apocalyptic number.

It is an amenable number.

522645420 is an abundant number, since it is smaller than the sum of its proper divisors (1073800788).

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

522645420 is a wasteful number, since it uses less digits than its factorization.

522645420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791910 (or 791908 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 522645420 is about 22861.4395872176. The cubic root of 522645420 is about 805.5065006848.

The spelling of 522645420 in words is "five hundred twenty-two million, six hundred forty-five thousand, four hundred twenty".