521245464 has 64 divisors (see below), whose sum is σ = 1339238880. Its totient is φ = 168960000.

The previous prime is 521245457. The next prime is 521245489. The reversal of 521245464 is 464542125.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 393924 + ... + 395244.

Almost surely, 2^521245464 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 521245464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (669619440).

521245464 is an abundant number, since it is smaller than the sum of its proper divisors (817993416).

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

521245464 is a wasteful number, since it uses less digits than its factorization.

521245464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772 (or 1768 counting only the distinct ones).

The product of its digits is 38400, while the sum is 33.

The square root of 521245464 is about 22830.8007743925. The cubic root of 521245464 is about 804.7866487054.

Adding to 521245464 its reverse (464542125), we get a palindrome (985787589).

The spelling of 521245464 in words is "five hundred twenty-one million, two hundred forty-five thousand, four hundred sixty-four".