521326368 has 72 divisors (see below), whose sum is σ = 1537453008. Its totient is φ = 173772864.

The previous prime is 521326343. The next prime is 521326373. The reversal of 521326368 is 863623125.

It is a happy number.

521326368 is a `hidden beast` number, since 5 + 2 + 13 + 2 + 636 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25746 + ... + 41297.

It is an arithmetic number, because the mean of its divisors is an integer number (21353514).

Almost surely, 2^521326368 is an apocalyptic number.

It is an amenable number.

521326368 is an abundant number, since it is smaller than the sum of its proper divisors (1016126640).

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

521326368 is an equidigital number, since it uses as much as digits as its factorization.

521326368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67068 (or 67048 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 521326368 is about 22832.5725226046. The cubic root of 521326368 is about 804.8282842975.

The spelling of 521326368 in words is "five hundred twenty-one million, three hundred twenty-six thousand, three hundred sixty-eight".