521537880 has 128 divisors (see below), whose sum is σ = 1641669120. Its totient is φ = 132295680.

The previous prime is 521537879. The next prime is 521537881. The reversal of 521537880 is 88735125.

It is an interprime number because it is at equal distance from previous prime (521537879) and next prime (521537881).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521537881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 642675 + ... + 643485.

It is an arithmetic number, because the mean of its divisors is an integer number (12825540).

Almost surely, 2^521537880 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 521537880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (820834560).

521537880 is an abundant number, since it is smaller than the sum of its proper divisors (1120131240).

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

521537880 is a wasteful number, since it uses less digits than its factorization.

521537880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 521537880 is about 22837.2038568648. The cubic root of 521537880 is about 804.9371142831.

The spelling of 521537880 in words is "five hundred twenty-one million, five hundred thirty-seven thousand, eight hundred eighty".