521240464 has 10 divisors (see below), whose sum is σ = 1009903430. Its totient is φ = 260620224.

The previous prime is 521240459. The next prime is 521240537. The reversal of 521240464 is 464042125.

It can be written as a sum of positive squares in only one way, i.e., 381811600 + 139428864 = 19540^2 + 11808^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16288749 + ... + 16288780.

It is an arithmetic number, because the mean of its divisors is an integer number (100990343).

Almost surely, 2^521240464 is an apocalyptic number.

It is an amenable number.

521240464 is a deficient number, since it is larger than the sum of its proper divisors (488662966).

521240464 is a wasteful number, since it uses less digits than its factorization.

521240464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32577537 (or 32577531 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 521240464 is about 22830.6912729335. The cubic root of 521240464 is about 804.7840754161.

Adding to 521240464 its reverse (464042125), we get a palindrome (985282589).

The spelling of 521240464 in words is "five hundred twenty-one million, two hundred forty thousand, four hundred sixty-four".