4640320521 has 16 divisors (see below), whose sum is σ = 6885102720. Its totient is φ = 3088797840.

The previous prime is 4640320511. The next prime is 4640320523. The reversal of 4640320521 is 1250230464.

It is not a de Polignac number, because 4640320521 - 2⁶ = 4640320457 is a prime.

It is a super-2 number, since 2×4640320521² = 43065149075227422882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4640320523) 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 15 ways as a sum of consecutive naturals, for example, 113965 + ... + 149226.

It is an arithmetic number, because the mean of its divisors is an integer number (430318920).

Almost surely, 2^4640320521 is an apocalyptic number.

It is an amenable number.

4640320521 is a deficient number, since it is larger than the sum of its proper divisors (2244782199).

4640320521 is a wasteful number, since it uses less digits than its factorization.

4640320521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263853 (or 263847 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 4640320521 is about 68119.8981282268. The cubic root of 4640320521 is about 1667.9485873859.

Adding to 4640320521 its reverse (1250230464), we get a palindrome (5890550985).

The spelling of 4640320521 in words is "four billion, six hundred forty million, three hundred twenty thousand, five hundred twenty-one".