521706072 has 16 divisors (see below), whose sum is σ = 1304265240. Its totient is φ = 173902016.

The previous prime is 521706071. The next prime is 521706077. The reversal of 521706072 is 270607125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521706071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10868853 + ... + 10868900.

Almost surely, 2^521706072 is an apocalyptic number.

It is an amenable number.

521706072 is an abundant number, since it is smaller than the sum of its proper divisors (782559168).

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

521706072 is a wasteful number, since it uses less digits than its factorization.

521706072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21737762 (or 21737758 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 521706072 is about 22840.8859723085. The cubic root of 521706072 is about 805.0236336824.

The spelling of 521706072 in words is "five hundred twenty-one million, seven hundred six thousand, seventy-two".