521428992 has 168 divisors, whose sum is σ = 1621130616. Its totient is φ = 148635648.

The previous prime is 521428967. The next prime is 521428997. The reversal of 521428992 is 299824125.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521428997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1204008 + ... + 1204440.

It is an arithmetic number, because the mean of its divisors is an integer number (9649587).

Almost surely, 2^521428992 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 521428992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (810565308).

521428992 is an abundant number, since it is smaller than the sum of its proper divisors (1099701624).

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

521428992 is an equidigital number, since it uses as much as digits as its factorization.

521428992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 445 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 521428992 is about 22834.8197277754. The cubic root of 521428992 is about 804.8810914473.

The spelling of 521428992 in words is "five hundred twenty-one million, four hundred twenty-eight thousand, nine hundred ninety-two".