522161640 has 960 divisors, whose sum is σ = 2502783360. Its totient is φ = 95800320.

The previous prime is 522161603. The next prime is 522161641. The reversal of 522161640 is 46161225.

522161640 is a `hidden beast` number, since 5 + 2 + 2 + 1 + 616 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (522161641) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 22702669 + ... + 22702691.

It is an arithmetic number, because the mean of its divisors is an integer number (2607066).

Almost surely, 2^522161640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 522161640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1251391680).

522161640 is an abundant number, since it is smaller than the sum of its proper divisors (1980621720).

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

522161640 is a wasteful number, since it uses less digits than its factorization.

522161640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 522161640 is about 22850.8564390922. The cubic root of 522161640 is about 805.2578883890.

The spelling of 522161640 in words is "five hundred twenty-two million, one hundred sixty-one thousand, six hundred forty".