521249280 has 160 divisors (see below), whose sum is σ = 1692909504. Its totient is φ = 136790016.

The previous prime is 521249279. The next prime is 521249293. The reversal of 521249280 is 82942125.

It is a tau number, because it is divible by the number of its divisors (160).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514054 + ... + 515066.

Almost surely, 2^521249280 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 521249280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846454752).

521249280 is an abundant number, since it is smaller than the sum of its proper divisors (1171660224).

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

521249280 is a wasteful number, since it uses less digits than its factorization.

521249280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 521249280 is about 22830.8843455526. The cubic root of 521249280 is about 804.7886126287.

The spelling of 521249280 in words is "five hundred twenty-one million, two hundred forty-nine thousand, two hundred eighty".