521977272 has 128 divisors (see below), whose sum is σ = 1447027200. Its totient is φ = 156169728.

The previous prime is 521977259. The next prime is 521977279. The reversal of 521977272 is 272779125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521977279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1646458 + ... + 1646774.

It is an arithmetic number, because the mean of its divisors is an integer number (11304900).

Almost surely, 2^521977272 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 521977272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723513600).

521977272 is an abundant number, since it is smaller than the sum of its proper divisors (925049928).

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

521977272 is a wasteful number, since it uses less digits than its factorization.

521977272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 521 counting only the distinct ones).

The product of its digits is 123480, while the sum is 42.

The square root of 521977272 is about 22846.8219234098. The cubic root of 521977272 is about 805.1631021185.

The spelling of 521977272 in words is "five hundred twenty-one million, nine hundred seventy-seven thousand, two hundred seventy-two".