521661072 has 40 divisors (see below), whose sum is σ = 1349085280. Its totient is φ = 173698560.

The previous prime is 521661071. The next prime is 521661097. The reversal of 521661072 is 270166125.

It is not an unprimeable number, because it can be changed into a prime (521661071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43047 + ... + 53817.

It is an arithmetic number, because the mean of its divisors is an integer number (33727132).

Almost surely, 2^521661072 is an apocalyptic number.

It is an amenable number.

521661072 is an abundant number, since it is smaller than the sum of its proper divisors (827424208).

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

521661072 is a wasteful number, since it uses less digits than its factorization.

521661072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11791 (or 11785 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 521661072 is about 22839.9008754416. The cubic root of 521661072 is about 805.0004871208. Note that the first 3 decimals are identical.

The spelling of 521661072 in words is "five hundred twenty-one million, six hundred sixty-one thousand, seventy-two".