521288274 has 48 divisors (see below), whose sum is σ = 1145943072. Its totient is φ = 157981824.

The previous prime is 521288191. The next prime is 521288291. The reversal of 521288274 is 472882125.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64102 + ... + 71774.

It is an arithmetic number, because the mean of its divisors is an integer number (23873814).

Almost surely, 2^521288274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521288274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (572971536).

521288274 is an abundant number, since it is smaller than the sum of its proper divisors (624654798).

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

521288274 is a wasteful number, since it uses less digits than its factorization.

521288274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7771 (or 7758 counting only the distinct ones).

The product of its digits is 71680, while the sum is 39.

The square root of 521288274 is about 22831.7383043867. The cubic root of 521288274 is about 804.8086805347.

The spelling of 521288274 in words is "five hundred twenty-one million, two hundred eighty-eight thousand, two hundred seventy-four".